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{{Infobox element
{{Infobox
| autoheaders =yes
|engvar={{{engvar|}}}
| templatestyles = Infobox element/styles.css
|number=55
| headerstyle =color:inherit; background:{{Infobox element/symbol-to-block|symbol={{{symbol|}}}|format=bgcolor}}
|symbol=Cs
| labelstyle =
|name=caesium
| datastyle =
|alt name=cesium (US)
| belowstyle =color:inherit; background:{{Infobox element/symbol-to-block|symbol={{{symbol|}}}|format=bgcolor}}
|abundance=
<!--
|abundance in earth's crust=

|abundance in oceans=
TITLE ----------------
|abundance in solar system=
-->| title =<span class="nowrap">{{ucfirst:{{{name|{{PAGENAME}}}}}}},&nbsp;<sub>{{{Z|00}}}</sub>{{{symbol|Xx}}}</span>
|left=[[xenon]]
<!--
|right=[[barium]]

|above=[[rubidium|Rb]]
THEORETICAL ELEMENT: #if: (Z >=119) only ----------------
|below=[[francium|Fr]]
-->|abovestyle=color:inherit; background:#e6e6e6;
|appearance=pale gold
|above={{#ifexpr:({{{Z|0}}}>=119)|''Theoretical element''}}
|image name=Cesium.jpg
<!--
|electrons per shell=2, 8, 18, 18, 8, 1

|phase=
IMAGE ----------------
|phase comment=
-->| image1 ={{#invoke:InfoboxImage|InfoboxImage
|density gplstp=
|image={{{image name|}}}
|density gpcm3nrt=1.93
|sizedefault=frameless
|density gpcm3nrt 2=
|upright={{#if:{{{image upright|}}}|{{{image upright|}}}|1}}
|density gpcm3mp=1.843
|alt={{Infobox element/symbol-to-top-image/alt|symbol={{{symbol|}}} |default=}}
|melting point K=301.7
}}
|melting point C=28.5
| caption1 ={{Infobox element/symbol-to-top-image/caption|symbol={{{symbol|}}} |default=}}<!--
|melting point F=83.3

|sublimation point K=
GENERAL PROPERTIES ---------------- -->
|sublimation point C=
|header10 ={{ucfirst:{{{name|{{PAGENAME}}}}}}}
|sublimation point F=
| label11 =Pronunciation
|boiling point K=944
| data11 ={{infobox element/pronunciation|symbol={{{symbol|}}} |ipa1={{Infobox element/symbol-to-pronunciation|symbol={{{symbol|}}}|item=ipa1|default=}}}}<!-- early check for ipa1 -->
|boiling point C=671
| label12 =Proposed formal name
|boiling point F=1240
| data12 ={{{proposed name|}}}<!-- only to be used for newly discovered elements. Not used since Mc, Nh, Ts, Og are formally named (Nov 2016) -->
|triple point K=
| label13 =Alternative name{{#if:{{{alt names|}}}|s}}
|triple point kPa=
| data13 ={{{alt name|}}}{{{alt names|}}}
|critical point K=1938
| label14 =[[Allotropy|Allotropes]]
|critical point MPa=9.4
| data14 ={{Infobox element/symbol-to-allotropes|symbol={{{symbol|}}} |format=infobox}}
|critical point ref=<ref name=b92>{{RubberBible92nd|page=4.121}}</ref>
| label15 =Appearance
|heat fusion=2.09
| data15 ={{{appearance|}}}<!--
|heat fusion 2=

|heat vaporization=63.9
SAW standard atomic weight (value-type 1=[range], 2=number(u), 3=no s.a.w.: mass number below) (11Jan2023) -->
|heat capacity=32.210
| data16 ={{#switch:{{Infobox element/symbol-to-saw/value-type|symbol={{{symbol|}}}}}
|vapor pressure 1=418
|1|2={{infobox |child =yes
|vapor pressure 10=469
|headerstyle =text-align: left; color:inherit; background: transparant;
|vapor pressure 100=534
| header1 =[[Standard atomic weight]] {{nobold|1=''A''<sub>r</sub>&deg;({{{symbol|}}})}}
|vapor pressure 1 k=623
| label2 =<nowiki/>
|vapor pressure 10 k=750
| data2 ={{Infobox element/standard atomic weight format
|vapor pressure 100 k=940
|symbol ={{{symbol|}}}
|vapor pressure comment=
|standard ={{Infobox element/symbol-to-saw/standard|symbol={{{symbol|}}}|default=}}
|crystal structure=bodycentredcubic
|abridged ={{Infobox element/symbol-to-saw/abridged|symbol={{{symbol|}}}|default=}}
|electronegativity=0.79
|ref ={{CIAAW2021}} }} }} }}
|number of ionization energies=3

|ionization energy 1=375.7
| label17 =[[Mass number]]
|ionization energy 2=2234.3
| data17 ={{Infobox element/symbol-to-most-stable-isotope |symbol={{{symbol|}}}|format=[]|default=}} {{{mass number comment|}}}<!--
|ionization energy 3=3400

|atomic radius=265
abundance -->
|atomic radius calculated=
| label18 =[[Abundance of the chemical elements|Abundance]]
|covalent radius=244±11
| data18 ={{{abundance|}}}
|Van der Waals radius=343
| data19 ={{#if:{{{abundance in earth's crust|}}}{{{abundance in oceans|}}}{{{abundance in solar system|}}}|
|magnetic ordering=[[paramagnetic]]
{{infobox|child=yes
|magnetic ordering ref=<ref name=magnet>{{cite book|url=http://www-d0.fnal.gov/hardware/cal/lvps_info/engineering/elementmagn.pdf|format=PDF|chapter=Magnetic susceptibility of the elements and inorganic compounds|title=Handbook of Chemistry and Physics|edition=87th|publisher=CRC press|access-date=2010-09-26|isbn=0-8493-0487-3}}</ref>
|headerstyle =text-align:left; line-height:1em;
|electrical resistivity=
| header1 ={{#if:{{{abundance|}}} |<!-- not here --> |{{#if:{{{abundance in earth's crust|}}}{{{abundance in oceans|}}}{{{abundance in solar system|}}} |[[Abundance of the chemical elements|Abundance]]}} }}
|electrical resistivity unit prefix=n
| labelstyle =line-height:1em; text-indent:1.2em; font-weight:normal;
|electrical resistivity at 0=
| datastyle =line-height:1em;
|electrical resistivity at 20=205
| label11 =in&nbsp;the&nbsp;[[Abundance of elements in Earth's crust|Earth's crust]]
|thermal conductivity=35.9
| data11 ={{{abundance in earth's crust|}}}
|thermal conductivity 2=
| label12 =in the [[Abundance of the chemical elements#Oceanic elemental abundance|oceans]]
|thermal diffusivity=
| data12 ={{{abundance in oceans|}}}
|thermal expansion=
| label13 =in the [[Abundances of the elements (data_page)#Sun and solar system|solar system]]
|thermal expansion at 25=97
| data13 ={{{abundance in solar system|}}}
|speed of sound=
}}}}<!--
|speed of sound rod at 20=

|speed of sound rod at r.t.=
IN THE PERIODIC TABLE ---------------- -->
|magnetic susceptibility=
|header20 ={{ucfirst:{{{name}}}}} in the [[periodic table]]
|magnetic susceptibility ref=
| data22 ={{Infobox element/periodic table |name={{{name}}} |number={{{Z|0}}} |symbol={{{symbol}}} |mark={{{symbol|}}} |above={{{above}}} |below={{{below}}} |left={{{left}}} |right={{{right}}} }}
|tensile strength=
| label23 ={{nowrap|1=[[Atomic number]] <span style="font-weight:normal;">(''Z'')</span>}}
|Young's modulus=1.7
| data23 ={{{Z|}}}
|Shear modulus=

|Bulk modulus=1.6
| label24 =[[Group (periodic table)|Group]]
|Poisson ratio=
| data24 ={{Infobox element/symbol-to-group|symbol={{{symbol|}}}|format=infobox element}}{{{group ref|}}} {{{group comment|}}}
|Mohs hardness=0.2

|Vickers hardness=
| label25 =[[Period (periodic table)|Period]]
|Brinell hardness=0.14
| data25 ={{Infobox element/symbol-to-period |symbol={{{symbol|}}} |format=infobox element}}{{{period ref|}}} {{{period comment|}}}
|CAS number=7440-46-2

|discovery date=1860
| label26 =[[Block (periodic table)|Block]]
|first isolation by=[[Carl Setterberg]]
| data26 ={{Infobox element/block format
|first isolation date=1882
|symbol={{{symbol|}}}
|QID=Q1108
|block={{Infobox element/symbol-to-block|symbol={{{symbol|}}} |default=}}<!-- returns text 's-block' -->
}}{{{block ref|}}} {{{block comment|}}}

| label31 =[[Electron configuration]]
| data31 ={{#switch:{{{Z|1}}}|122|124|126=<!-- suppressed -->|{{Infobox element/symbol-to-electron-configuration|symbol={{{symbol|}}}|format=comment, ref}}}} {{{electron configuration comment|}}}

| label32 =Electrons per shell
| data32 ={{{electrons per shell|}}}{{{electrons per shell ref|}}} {{{electrons per shell comment|}}}<!--

PHYSICAL PROPERTIES ------------------>
|header40 =Physical properties
| data41 ={{{physical properties comment|}}}{{{physical properties|}}}
| label43 ={{Engvar|defaultWord=Color |engvar={{{engvar|}}}<!--
-->|defaultLang=en-US |en-GB=Colour |en-OED=Colour |engvarCat=no}}
| data43 ={{{color|}}}

| label44 =[[Phase (matter)|Phase]] {{nobold|1=at&nbsp;<span title="STP: standard temperature and pressure: 0&nbsp;°C and 101.325&nbsp;kPa">[[Standard temperature and pressure|STP]]</span>}}
| data44 ={{#if:{{{phase|}}}|{{{phase|}}}|{{Infobox element/symbol-to-phase|symbol={{{symbol|}}}|format=wl}}}} {{{phase comment|}}}

| label45 =[[Melting point]]
| data45 ={{#if:{{{melting point K|}}} |{{{melting point prefix|}}} {{{melting point K}}}&nbsp;[[Kelvin|K]]&#x20;&#x200b;({{{melting point C}}}&nbsp;°C,&#x20;&#x200b;{{{melting point F}}}&nbsp;°F){{{melting point ref|}}}&#x20;{{{melting point comment|}}} }}
| label46 =[[Boiling point]]
| data46 ={{#if:{{{boiling point K|}}} |{{{boiling point prefix|}}} {{{boiling point K}}}&nbsp;K&#x20;&#x200b;({{{boiling point C}}}&nbsp;°C,&#x20;&#x200b;{{{boiling point F}}}&nbsp;°F){{{boiling point ref|}}}&#x20;{{{boiling point comment|}}} }}
| label47 =[[Sublimation (phase transition)|Sublimation point]]
| data47 ={{#if:{{{sublimation point K|}}} |{{{sublimation point K}}}&nbsp;K&#x20;&#x200b;({{{sublimation point C}}}&nbsp;°C,&#x20;&#x200b;{{{sublimation point F}}}&nbsp;°F){{{sublimation point ref|}}}&#x20;{{{sublimation point comment|}}} }}

| label50 =[[Density]]<span style="font-weight:normal;"> {{{density conditions|}}}</span>
| data50 ={{{density|}}}
| label51 ={{#if:{{{density|}}}||[[Density]]&#x20;}}<span style="font-weight:normal;">(at&nbsp;STP)</span>
| data51 ={{#if:{{{density gplstp|}}}
| {{{density gplstp}}}&nbsp;g/L{{{density gplstp ref|}}}<!---->{{#if:{{{density gplstp comment|}}} |&#x20;{{{density gplstp comment}}}}}<!--
-->}}
| label52 ={{#if:{{{density|}}}{{{density gplstp|}}}||[[Density]]&#x20;}}<span style="font-weight:normal;">(near&nbsp;[[room temperature|r.t.]])</span>
| data52 ={{#if:{{{density gpcm3nrt|}}}
| {{{density gpcm3nrt}}}&nbsp;g/cm<sup>3</sup>{{{density gpcm3nrt ref|}}}<!---->{{#if:{{{density gpcm3nrt comment|}}} |&#x20;{{{density gpcm3nrt comment}}}}}<!--
-->}} {{#if:{{{density gpcm3nrt 2|}}}
| <br/>{{#if:{{{density gpcm3nrt|}}}||{{red|Parameter <nowiki>{{{density gpcm3nrt}}}</nowiki> should be used first}}<br/>}}{{{density gpcm3nrt 2}}}&nbsp;g/cm<sup>3</sup>{{{density gpcm3nrt 2 ref|}}}&#x20;{{{density gpcm3nrt 2 comment|}}}<!--
-->}} {{#if:{{{density gpcm3nrt 3|}}}
| <br/>{{{density gpcm3nrt 3}}}&nbsp;g/cm<sup>3</sup>{{{density gpcm3nrt 3 ref|}}}&#x20;{{{density gpcm3nrt 3 comment|}}}<!--
-->}}
| label53 ={{#if:{{{density|}}}{{{density gplstp|}}}{{{density gpcm3nrt|}}} ||[[Density]]&#x20;}}<span style="font-weight:normal;">when&nbsp;liquid (at&nbsp;[[melting point|m.p.]])</span>
| data53 ={{#if:{{{density gpcm3mp|}}} |{{{density gpcm3mp}}}&nbsp;g/cm<sup>3</sup>{{{density gpcm3mp ref|}}}&#x20;{{{density gpcm3mp comment|}}} }}
| label54 ={{#if:{{{density|}}}{{{density gplstp|}}}{{{density gpcm3nrt|}}}{{{density gpcm3mp|}}} ||[[Density]]&#x20;}}<span style="font-weight:normal;">when&nbsp;liquid (at&nbsp;[[boiling point|b.p.]])</span>
| data54 ={{#if:{{{density gpcm3bp|}}} |{{{density gpcm3bp}}}&nbsp;g/cm<sup>3</sup>{{{density gpcm3bp ref|}}}&#x20;{{{density gpcm3bp comment|}}} }}

| label55 =[[Molar volume]]
| data55 ={{#if:{{{molar volume|}}}|{{{molar volume|}}}&nbsp;{{#if:{{{molar volume unit|}}}|{{{molar volume unit|}}}|cm<sup>3</sup>/mol{{{molar volume ref|}}}&#x20;}}{{{molar volume comment|}}}}}
| label56 =[[Triple point]]
| data56 ={{#if:{{{triple point K|}}} |{{{triple point K}}}&nbsp;K,&#x20;&#x200b;{{{triple point kPa}}}&nbsp;kPa{{{triple point ref|}}}&#x20;{{{triple point comment|}}} }}<!--
-->{{#if:{{{triple point K 2|}}} |<br/>{{{triple point K 2}}}&nbsp;K, {{{triple point kPa 2}}}&nbsp;kPa{{{triple point 2 ref|}}}&#x20;{{{triple point 2 comment|}}} }}
| label57 =[[Critical point (thermodynamics)|Critical point]]
| data57 ={{#if:{{{critical point K|}}} |{{{critical point K}}}&nbsp;K, {{{critical point MPa}}}&nbsp;MPa{{{critical point ref|}}}&#x20;{{{critical point comment|}}} }}
| label58 =[[Enthalpy of fusion|Heat of fusion]]
| data58 ={{#if:{{{heat fusion|}}} |{{{heat fusion}}}&nbsp;[[Kilojoule per mole|kJ/mol]]{{{heat fusion ref|}}}&#x20;{{{heat fusion comment|}}} }}<!--
-->{{#if:{{{heat fusion 2|}}} |<br/>{{{heat fusion 2}}}&nbsp;kJ/mol{{{heat fusion 2 ref|}}}&#x20;{{{heat fusion 2 comment|}}} }}
| label59 =[[Enthalpy of vaporization|Heat of {{Engvar|defaultWord=vaporization |engvar={{{engvar|}}}<!--
-->|defaultLang=en-US |en-GB=vaporisation |en-OED=vaporization |engvarCat=no}}]]
| data59 ={{#if:{{{heat vaporization|}}} |{{{heat vaporization}}}&nbsp;kJ/mol{{{heat vaporization ref|}}}&#x20;{{{heat vaporization comment|}}} }}
| label61 =[[Molar heat capacity]]
| data61 ={{#if:{{{heat capacity|}}} |{{{heat capacity}}}&nbsp;J/(mol·K){{{heat capacity ref|}}}&#x20;{{{heat capacity comment|}}} }}<!--
-->{{#if:{{{heat capacity 2|}}} |<br/>{{{heat capacity 2}}}&nbsp;J/(mol·K){{{heat capacity 2 ref|}}}&#x20;{{{heat capacity 2 comment|}}} }}
| data63 ={{#if:{{{vapor pressure 1|}}}{{{vapor pressure 100 k|}}}
| [[Vapor pressure|'''{{Engvar|defaultWord=Vapor |engvar={{{engvar|}}} |defaultLang=en-US |en-GB=Vapour |en-OED=Vapour |engvarCat=no}}&nbsp;pressure''']]{{{vapor pressure ref|}}}<!--
-->{{#if:{{{vapor pressure comment|}}} |&#x20;{{{vapor pressure comment}}} }}<!--
-->{{center block|1={{Infobox element/vapor pressure table |vp1={{{vapor pressure 1|&nbsp;}}} |vp10={{{vapor pressure 10|&nbsp;}}} |vp100={{{vapor pressure 100|&nbsp;}}} |vp1k={{{vapor pressure 1 k|&nbsp;}}} |vp10k={{{vapor pressure 10 k|&nbsp;}}} |vp100k={{{vapor pressure 100 k|&nbsp;}}} }}}}<!--
-->}}
| data64 ={{#if:{{{vapor pressure 1 2|}}}{{{vapor pressure 100 k 2|}}}
| '''{{Engvar|defaultWord=vapor |engvar={{{engvar|}}} |defaultLang=en-US |en-GB=Vapour |en-OED=Vapour |engvarCat=no}}&nbsp;pressure'''{{{vapor pressure 2 ref|}}}<!--
-->{{#if:{{{vapor pressure 2 comment|}}} |&#x20;{{{vapor pressure 2 comment|}}} }}<!--
-->{{center block|1={{Infobox element/vapor pressure table |vp1={{{vapor pressure 1 2|&nbsp;}}} |vp10={{{vapor pressure 10 2|&nbsp;}}} |vp100={{{vapor pressure 100 2|&nbsp;}}} |vp1k={{{vapor pressure 1 k 2|&nbsp;}}} |vp10k={{{vapor pressure 10 k 2|&nbsp;}}} |vp100k={{{vapor pressure 100 k 2|&nbsp;}}} }}}}<!--
-->}}<!--

ATOMIC PROPERTIES ------------------>
|header70 =Atomic properties
| data71 ={{{atomic properties comment|}}}{{{atomic properties|}}}
| label72 =[[Oxidation state]]s
| data72 ={{Infobox element/symbol-to-oxidation-state |symbol={{{symbol|}}} |engvar={{{engvar|}}} |engvarCat=no}}
| label73 =[[Electronegativity]]
| data73 ={{#if:{{{electronegativity|}}} | Pauling&nbsp;scale: {{{electronegativity}}}{{{electronegativity ref|}}}&#x20;}}{{{electronegativity comment|}}}
| label75 =[[Ionization energy|{{Engvar|defaultWord=Ionization |engvar={{{engvar|}}} |defaultLang=en-US |en-GB=Ionisation |en-OED=Ionization |engvarCat=no}} energies]]
| data75 ={{unbulleted list
|1={{#if:{{{ionization energy 1|}}} |1st:&nbsp;{{{ionization energy 1|}}}&nbsp;kJ/mol{{{ionization energy 1 ref|}}}&#x20;{{{ionization energy 1 comment|}}} }}
|2={{#if:{{{ionization energy 2|}}} |2nd:&nbsp;{{{ionization energy 2|}}}&nbsp;kJ/mol{{{ionization energy 2 ref|}}}&#x20;{{{ionization energy 2 comment|}}} }}
|3={{#if:{{{ionization energy 3|}}} |3rd:&nbsp;{{{ionization energy 3|}}}&nbsp;kJ/mol{{{ionization energy 3 ref|}}}&#x20;{{{ionization energy 3 comment|}}} }}
|4={{#ifexpr:0{{{number of ionization energies|0}}}>3 |([[Molar ionization energies of the elements#{{{name|}}}|more]])}}<!--
-->{{#if:{{{ionization energy 1|}}} |{{{ionization energy ref|}}}&#x20;{{{ionization energy comment|}}} }}
}}
| label76 =[[Atomic radius]]
| data76 ={{#if:{{{atomic radius|}}} |empirical:&#x20;{{{atomic radius}}}&nbsp;[[Picometre|pm]]{{{atomic radius ref|}}}&#x20;{{{atomic radius comment|}}} }}<!--
-->{{#if:{{{atomic radius calculated|}}} |{{#if:{{{atomic radius|}}}|<br/>}}calculated:&#x20;{{{atomic radius calculated}}}&nbsp;{{#if:{{{atomic radius|}}}|pm|[[Picometre|pm]]}}{{{atomic radius calculated ref|}}}&#x20;{{{atomic radius calculated comment|}}} }}
| label77 =[[Covalent radius]]
| data77 ={{#if:{{{covalent radius|}}} |{{{covalent radius}}}&nbsp;{{#if:{{{atomic radius|}}}{{{atomic radius calculated|}}}|pm|[[Picometre|pm]]}}{{{covalent radius ref|}}}&#x20;{{{covalent radius comment|}}} }}
| label78 =[[Van der Waals radius]]
| data78 ={{#if:{{{Van der Waals radius|}}} |{{{Van der Waals radius}}}&nbsp;{{#if:{{{atomic radius|}}}{{{atomic radius calculated|}}}{{{covalent radius|}}}|pm|[[Picometre|pm]]}}{{{Van der Waals radius ref|}}}&#x20;{{{Van der Waals radius comment|}}} }}
| data79 ={{Infobox element/spectral lines
|symbol={{{symbol|}}}
|name ={{{name|}}}
|image ={{Infobox element/symbol-to-spectral-lines-image|symbol={{{symbol|}}} }}|default=}}<!--

OTHER PROPERTIES ------------------>
|header100 =Other properties
| label101 =Natural occurrence
| data101 ={{Infobox element/symbol-to-occurrence|symbol={{{symbol|}}}|format=wl}}
| label103 =[[Crystal structure]]
| data103 ={{#if:{{{crystal structure prefix|}}}{{{crystal structure|}}}{{{crystal structure comment|}}}
| {{{crystal structure prefix|}}}&#x20;&#x200b;{{Infobox element/crystal structure |engvar={{{engvar|}}} |{{{crystal structure|}}}}}{{{crystal structure ref|}}}<!--
-->{{#if:{{{crystal structure|}}}| {{#if:{{{lattice constant|}}}{{{lattice constants|}}}||<!-- image here only if not at "lattice constant" --><div style="float:right;">{{#invoke:InfoboxImage|InfoboxImage |image={{Infobox element/crystal structure|{{{crystal structure|}}}|return=image}} |upright=0.23 |sizedefault=frameless |alt={{ucfirst:{{{crystal structure}}}}} crystal structure for {{{crystal structure prefix|}}}{{#if:{{{crystal structure prefix|}}}|&#x20;}}{{{name}}} }}</div>}} }}<!--
-->{{#if:{{{crystal structure Pearson symbol|}}} |&#x20;([[Pearson symbol|{{{crystal structure Pearson symbol|}}}]])}}<!--
-->{{#if:{{{crystal structure comment|}}} |{{#if:{{{crystal structure prefix|}}}{{{crystal structure|}}}|<br/>}}{{{crystal structure comment|}}} }}<!--
-->}}
| label104 =[[Lattice constant]]{{#if:{{{lattice constants|}}} |s}}
| data104 ={{#if:{{{lattice constant|}}}{{{lattice constants|}}}|<div style="float:right;">{{#invoke:InfoboxImage|InfoboxImage |image={{Infobox element/crystal structure|{{{crystal structure|}}}|return=image}} |upright=0.23 |sizedefault=frameless |alt={{ucfirst:{{{crystal structure}}}}} crystal structure for {{{crystal structure prefix|}}}{{#if:{{{crystal structure prefix|}}}|&#x20;}}{{{name}}} }}</div>{{{lattice constant|}}}{{{lattice constants|}}}}}
| label105 =Crystal structure
| data105 ={{#if:{{{crystal structure 2 prefix|}}}{{{crystal structure 2|}}}{{{crystal structure 2 comment|}}}
| {{{crystal structure 2 prefix|}}}&#x20;&#x200b;{{Infobox element/crystal structure |engvar={{{engvar|}}}|{{{crystal structure 2|}}}}}{{{crystal structure 2 ref|}}}<!--
-->{{#if:{{{crystal structure 2|}}}| {{#if:{{{lattice constant 2|}}}{{{lattice constants 2|}}}||<!-- image here only if not at "Lattice constant " --><div style="float:right;">{{#invoke:InfoboxImage|InfoboxImage |image={{Infobox element/crystal structure |{{{crystal structure 2|}}}|return=image}} |upright=0.23 |sizedefault=frameless |alt={{ucfirst:{{{crystal structure 2}}}}} crystal structure for {{{crystal structure 2 prefix|}}}{{#if:{{{crystal structure 2 prefix|}}}|&#x20;}}{{{name}}} }}</div>}} }}<!--
-->{{#if:{{{crystal structure 2 Pearson symbol|}}} |&#x20;([[Pearson symbol|{{{crystal structure 2 Pearson symbol|}}}]])}}<!--
-->{{#if:{{{crystal structure 2 comment|}}} |{{#if:{{{crystal structure 2 prefix|}}}{{{crystal structure 2|}}}|<br/>}}{{{crystal structure 2 comment|}}} }}<!--
-->}}
| label106 =Lattice constant{{#if:{{{lattice constants 2|}}} |s}}
| data106 ={{#if:{{{lattice constant 2|}}}{{{lattice constants 2|}}}|<div style="float:right;">{{#invoke:InfoboxImage|InfoboxImage |image={{Infobox element/crystal structure |{{{crystal structure 2|}}}|return=image}} |upright=0.23 |sizedefault=frameless |alt={{ucfirst:{{{crystal structure 2}}}}} crystal structure for {{{crystal structure 2 prefix|}}}{{#if:{{{crystal structure 2 prefix|}}}|&#x20;}}{{{name}}} }}</div>{{{lattice constant 2|}}}{{{lattice constants 2|}}}}}

| label110 =[[Coefficient of thermal expansion|Thermal expansion]]
| data110 ={{#if:{{{thermal expansion|}}}{{{thermal expansion comment|}}} |<!--
-->{{#if:{{{thermal expansion|}}} |{{{thermal expansion|}}}&nbsp;µm/(m⋅K){{{thermal expansion ref|}}}&#x20;}}{{{thermal expansion comment|}}} }}<!--
-->{{#if:{{{thermal expansion at 25|}}} |{{#if:{{{thermal expansion|}}}|<br/>}}{{{thermal expansion at 25}}}&nbsp;µm/(m⋅K)&#x20;(at&nbsp;25&nbsp;°C){{{thermal expansion at 25 ref|}}}&#x20;{{{thermal expansion at 25 comment|}}} }}

| label111 =[[Thermal conductivity]]
| data111 ={{#if:{{{thermal conductivity|}}} |{{{thermal conductivity}}}&nbsp;W/(m⋅K){{{thermal conductivity ref|}}}&#x20;{{{thermal conductivity comment|}}} }}<!--
-->{{#if:{{{thermal conductivity 2|}}} |<br/>{{{thermal conductivity 2}}}&nbsp;W/(m⋅K){{{thermal conductivity 2 ref|}}}&#x20;{{{thermal conductivity 2 comment|}}} }}

| label112 =[[Thermal diffusivity]]
| data112 ={{#if:{{{thermal diffusivity|}}} |{{{thermal diffusivity}}}&nbsp;mm<sup>2</sup>/s&#x20;(at&nbsp;300&nbsp;K){{{thermal diffusivity ref|}}}&#x20;{{{thermal diffusivity comment|}}} }}

| label113 =[[Electrical resistivity and conductivity|Electrical resistivity]]
| data113 ={{#if:{{{electrical resistivity|}}} |{{{electrical resistivity}}}&nbsp;{{{electrical resistivity unit prefix|}}}Ω⋅m{{{electrical resistivity ref|}}}&#x20;{{{electrical resistivity comment|}}} }}<!--
-->{{#if:{{{electrical resistivity at 0|}}} |{{#if:{{{electrical resistivity|}}}|<br/>}}{{{electrical resistivity at 0}}}&nbsp;{{{electrical resistivity unit prefix|}}}Ω⋅m&#x20;(at&nbsp;0&nbsp;°C){{{electrical resistivity at 0 ref|}}}&#x20;{{{electrical resistivity at 0 comment|}}} }}<!--
-->{{#if:{{{electrical resistivity at 20|}}} |{{#if:{{{electrical resistivity|}}}{{{electrical resistivity at 0|}}}|<br/>}}{{{electrical resistivity at 20}}}&nbsp;{{{electrical resistivity unit prefix|}}}Ω⋅m&#x20;(at&nbsp;20&nbsp;°C){{{electrical resistivity at 20 ref|}}}&#x20;{{{electrical resistivity at 20 comment|}}} }}
| label114 =[[Band gap]]
| data114 ={{#if:{{{band gap|}}} |{{{band gap}}}&nbsp;[[Electronvolt|eV]] (at&nbsp;300&nbsp;K){{{band gap ref|}}}&#x20;{{{band gap comment|}}} }}
| label115 =[[Curie temperature|Curie point]]
| data115 ={{#if:{{{Curie point K|}}} |{{{Curie point K}}}&nbsp;K{{{Curie point ref|}}}&#x20;{{{Curie point comment|}}} }}
| label118 =[[Magnetism|Magnetic ordering]]
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| label119 =[[Magnetic susceptibility|Molar magnetic susceptibility]]
| data119 ={{#if:{{{magnetic susceptibility|}}}|{{{magnetic susceptibility|}}}&nbsp;cm<sup>3</sup>/mol{{{magnetic susceptibility ref|}}}}}
| label122 =[[Ultimate tensile strength|Tensile strength]]
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| label123 =[[Young's modulus]]
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| label124 =[[Shear modulus]]
| data124 ={{#if:{{{Shear modulus|}}} |{{{Shear modulus}}}&nbsp;GPa{{{Shear modulus ref|}}}&#x20;{{{Shear modulus comment|}}} }}
| label125 =[[Bulk modulus]]
| data125 ={{#if:{{{Bulk modulus|}}} |{{{Bulk modulus}}}&nbsp;GPa{{{Bulk modulus ref|}}}&#x20;{{{Bulk modulus comment|}}}}}

| label127 =[[Speed of sound]]
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| label130 =[[Poisson's ratio|Poisson ratio]]
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| label131 =[[Mohs scale of mineral hardness|Mohs hardness]]
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| label133 =[[Vickers hardness test|Vickers hardness]]
| data133 ={{#if:{{{Vickers hardness|}}} |{{{Vickers hardness}}}&nbsp;MPa{{{Vickers hardness ref|}}}&#x20;{{{Vickers hardness comment|}}} }}
| label134 =[[Brinell hardness test|Brinell hardness]]
| data134 ={{#if:{{{Brinell hardness|}}} |{{{Brinell hardness}}}&nbsp;MPa{{{Brinell hardness ref|}}}&#x20;{{{Brinell hardness comment|}}} }}
| label138 =[[CAS Registry Number|CAS Number]]
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HISTORY ------------------>
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ISOTOPES ---- ----- ---- -----
About theoretical elements (Z >=119):
- See also |above=text.
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(1) does Article [[Isotopes of <element>]] exist? [Z=0-118, 119, 120].
(2) does Isobox [[Template:Infobox <element> isotopes]] exist? [Z=0-118].
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ISOBOX ---- ----- ---- -----
All data is read from Isobox [[Infobox uranium isotopes]]
When Z>=119: no Isobox (2023-01-01) -->
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}}<!-- END OF INFOBOX ========================

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--><noinclude>
--><noinclude>{{documentation}}</noinclude>
{{Infobox element/element navigation|symbol=Cs}}
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{{documentation|1=Template:Infobox element/doc}}
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Revision as of 10:28, 15 June 2024

Infobox caesium/sandbox, 00Xx
{{{name}}} in the periodic table
Hydrogen Helium
Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon
Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon
Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton
Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon
Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon
Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson
{{{above}}}

{{{symbol}}}

{{{below}}}
{{{left}}} ← {{{name}}} → {{{right}}}
[[Isotopes of {{{name}}}]]
Main isotopes[1] Decay
abun­dance half-life (t1/2) mode pro­duct
232U synth 68.9 y α 228Th
SF
233U trace 1.592×105 y[2] α 229Th
SF
234U 0.005% 2.455×105 y α 230Th
SF
235U 0.720% 7.04×108 y α 231Th
SF
236U trace 2.342×107 y α 232Th
SF
238U 99.3% 4.468×109 y α 234Th
SF
ββ 238Pu
 Category: Chemical elements
| references
  1. ^ Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
  2. ^ Magurno, B.A.; Pearlstein, S, eds. (1981). Proceedings of the conference on nuclear data evaluation methods and procedures. BNL-NCS 51363, vol. II (PDF). Upton, NY (USA): Brookhaven National Lab. pp. 835 ff. Retrieved 2014-08-06.