Pt | Cesium

Basic Information

Name

Cesium

Alternative Name

Caesium

Atomic Number

Appearance

Silvery gold

Phase At STP

Solid

Source

Wikipedia

Bohr Model

Static

Interactive

Descriptive Numbers

CAS Number

7440-46-2

CID Number

CID5354618

DOT Number

1407

RTECS Number

RTECSFK9225000

Mendeleev Number

Pettifor Number

Space Group Number

229

Glawe Number

Mass

Atomic Mass

132.905452 Da

Uncertainty

6e-8

Periodic Position

X Position

Y Position

Period

Group

Classification

Block

Abundance

Urban Soil

0.005 mg/kg

Seawater

3e-10 kg/L

Earth Crust

0.000003 g

Human Body

0.000002 %

Solar System

3.7e-7 mole ratio to silicon

Meteorites

0.000014 %

Color

Jmol

#57178F

Molcas Gv

#57178F

CPK

#FF1493

Atomic Radius

Empirical

265

Calculated

298

Van Der Waals

343

Batsanov

300

Rahm

249

Uff

451.7

Mm3

344

Alvarez

348

Bragg

237

Truhlar

343

Covalent (Single Bound)

225

Covalent (Cordero)

244

Covalent (Pyykko)

232

Covalent (Pyykko Double)

209

Mendeleev

235

C12

267

Metallic

265

Temperature

Melting/Freeze (USE)

301.7 °K

Melting/Freeze (WEL)

301.59 °K

Melting/Freeze (CRC)

301.5 °K

Melting/Freeze (LNG)

301.44 °K

Boiling/Density (USE)

944 °K

Boiling/Density (WEL)

944 °K

Boiling/Density (CRC)

944 °K

Boiling/Density (LNG)

941.2 °K

Boiling/Density (Zhang)

963 °K

Critical Temperature

1938 °K

Critical Pressure

9.4 MPa

Density

STP

1.93 kg/cm³

Solid (WEL)

1879 kg/cm³

Solid (CRC)

1930 kg/cm³

Solid (LNG)

1878.5 kg/cm³

Liquid (CR2)

1843 kg/cm³

Heat

Molar Volume

70.94 cm³/mol

Atomic Volume

70 cm³

Heat Of Fusion USE

2.09 kJ/mol

Heat Of Fusion CRC

2.09 kJ/mol

Heat Of Fusion LNG

2.09 kJ/mol

Heat Of Fusion WEL

2.09 kJ/mol

Evaporation USE

68.3 kJ/mol

Evaporation LNG

63.9 kJ/mol

Evaporation WEL

65 kJ/mol

Evaporation Zhang

66.1 kJ/mol

Molar Heat

32.21 J/molK

Heat Capacity USE

0.241 J/gK

Heat Capacity CRC

32.21 J/gK

Heat Capacity LNG

32.2 J/gK

Heat Capacity WEL

32.2 J/gK

Thermal Conductivity

35.9 W/m*K

Adiabatic Index

N/A

Electrical Resistance

80k

41.6 nΩm

273k

187 nΩm

293k

205 nΩm

298k

208 nΩm

300k

210 nΩm

Magnetic Properties

Order

paramanyetic

Susceptibility

2.8e-9 m3/kg

Elasticity

Bulk Modulus

1.6 GPa

Youngs Modulus

1.7 GPa

Hardness

Mohs

0.2

Brinell

0.147

Etymology

Description

It is a soft, silvery-white metal element belonging to the first group. It is one of the three metals that are liquid at room temperature. Cs-133 is its natural and only stable isotope. There are 15 more radioisotopes. Cesium reacts explosively with cold water and ice above 157K. Cesium hydroxide is the strongest known base. Cesium is the most electropositive, most alkaline element and has the least ionization potential of all elements. Its known uses include being a key component of atomic clocks, a catalyst for the hydrogenation of some organic compounds, and photoelectric cells. Cesium was discovered spectroscopically in 1860 by Gustav Kirchoff and Robert Bunsen. It was found thanks to the bright blue lines in its spectrum. The name of the element comes from the Latin word caesius, meaning sky blue. It should be noted that cesium is extremely toxic. Some radioisotopes are even more toxic.

Language Of Origin

Latin

Origin Of Word

From the Latin word ceasius meaning "sky blue"

Meaning

blue-grey or sky blue

Symbol Origin

descriptor (colour): Latin caesius

Etymological Description

It comes from the Latin caesius, meaning "sky blue". It is diagnosed by the bright blue lines in its spectrum. It is the first element discovered by spectrum analysis.

Discovery & Isolation

Observed/Predicted By

R. Bunsen ve R. Kirchhoff

Observed/Discovery Year

1860

Discovery Location

Isolated Sample By

C. Setterberg

Isolated Sample Year

1882

Production & Use

Sources

It is found in polylusite [(Cs4Al4Si9O26).H2O] and small amounts of lepidolite.

Uses

It is used as a "degasser" to eliminate air residues in vacuum and cathode ray tubes. It is also used in the construction of atomic clocks and photoelectric devices. Since it ionizes immediately, it is used as the engine fuel of the ion rocket.

Radioactivity

Half Life

Stable

Lifetime

Stable

Neutron Mass Absorption

0.0077

Neutron Cross Section

Electron Affinity

Electron Affinity (eV)

0.471626

Electron Affinity (kJ/mol)

45.505

Electron Affinity (pauling)

0.79

Electron Affinity (allen)

3.898

Electron Affinity (ghosh)

0.1542125

Dipole Polarity

Accepted

400.9

Uncertainty

0.7

C6 GB

6660

Lattice

Constant Internal Default Radius

6.05

Constant

614.1, 614.1, 614.1

Strucutre

BCC

Angles

p/2, p/2, p/2

Electron & Quantum

Oxidation States

−1,1

Electron Configuration

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s1

Quantum Number

2S1/2

Electron Configuration Semantic

[Car] 6s1

Shells-0

Shells-1

Shells-2

Shells-3

Shells-4

Shells-5

Ionization Energies-0

375.7

Ionization Energies-1

2234.3

Ionization Energies-2

3400

List of Compounds

1-10 of 44 compounds

Rows per page:

Formula	Names
Cs	cesium caesium cesium metal
CsBr	cesium bromide caesium bromide tricesium tribromide
CsBr3	cesium tribromide
CsCl	cesium chloride caesium chloride cesium monochloride dicesium dichloride
CsF	cesium fluoride caesium fluoride cesium monofluoride
CsI	cesium iodide caesium iodide cesium iodide (cs2I2) cesium iodide (cs3I3) cesium monoiodide
CsI3	cesium triiodide
CsN3	cesium azide
CsO2	cesium superoxide
Cs2O3	cesium trioxide

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