Potassium

Cesium

Potassium Cesium Comparison

Potassium

Cesium

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1 Periodic Table

1.1 Symbol

1.2 Group Number

0 17

1.3 Period Number

2 7

1.4 Block

s block

1.5 Element Family

Alkali

1.6 CAS Number

74400977440462

7429905 54386242

1.7 Space Group Name

Im_ 3m

1.8 Space Group Number

229.00229.00

11 229

2 Facts

2.1 Interesting Facts

In the list of most abundant element Potassium is ranked 7th.
Potassium can easily be sliced (chopped) down using knife.

Not Available

2.2 Sources

Found in Minerals, Mining

Earth's crust, Found in Minerals, Mining, Ores of Minerals

2.3 History

2.3.1 Who Discovered

Humphry Davy

Robert Bunsen and Gustav Kirchhoff

2.3.2 Discovery

In 1807

In 1860

2.4 Abundance

2.4.1 Abundance In Universe

3 * 10^-4 %8 * 10^-8 %

5E-09 0.11

2.4.2 Abundance In Sun

~0.0004 %~0.0000008 %

1E-08 0.1

2.4.3 Abundance In Meteorites

0.07 %0.00 %

1.7E-07 22

2.4.4 Abundance In Earth's Crust

1.50 %0.00 %

9.9E-12 8.1

2.4.5 Abundance In Oceans

0.04 %0.00 %

2E-23 1.1

2.4.6 Abundance In Humans

0.20 %0.00 %

1E-13 1.4

3 Uses

3.1 Uses & Benefits

Potassium’s compounds are in high demand for their application in Fertilizer manufacturing.
Potassium carbonate is used in glass manufacturing and Potassium carbonate in manufacturing detergent and body wash.

The most common use of cesium metal is as a drilling fluid. It is also used in optical glass manufacturing.
In vacuum tubes and radiation monitor equipment this metal is used as a catalyst promoter.

3.1.1 Industrial Uses

Ammunition Industry, Chemical Industry

Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry

3.1.2 Medical Uses

Pharmaceutical Industry

3.1.3 Other Uses

Alloys

3.2 Biological Properties

3.2.1 Toxicity

Toxic

Mildly Toxic

3.2.2 Present in Human Body

✔ ✘

3.2.3 In Blood

1,620.00 Blood/mg dm-30.00 Blood/mg dm-3

0 1970

3.2.4 In Bone

2,100.00 p.p.m.0.05 p.p.m.

0 170000

4 Physical

4.1 Melting Point

63.65 °C28.50 °C

27 3410

4.2 Boiling Point

774.00 °C678.40 °C

147 5660

4.3 Appearance

4.3.1 Physical State

Solid

4.3.2 Color

Silvery Gray

Silvery Gold

4.3.3 Luster

4.4 Hardness

4.4.1 Mohs Hardness

0.400.20

0.2 8.5

4.4.2 Brinell Hardness

0.36 MPa0.14 MPa

0.14 3490

4.4.3 Vickers Hardness

NANA

121 3430

4.5 Speed of Sound

2,000.00 m/sNA

818 16200

4.6 Optical Properties

4.6.1 Refractive Index

NANA

1.000933 1.7229

4.6.2 Reflectivity

NANA

58 97

4.7 Allotropes

✔ ✘

4.7.1 α Allotropes

Not Available

4.7.2 β Allotropes

Not Available

4.7.3 γ Allotropes

Not Available

5 Chemical

5.1 Chemical Formula

5.2 Isotopes

5.2.1 Known Isotopes

2036

0 38

5.3 Electronegativity

5.3.1 Pauling Electronegativity

0.820.79

0.7 2.54

5.3.2 Sanderson Electronegativity

0.450.22

0.22 2.56

5.3.3 Allred Rochow Electronegativity

0.910.86

0.86 1.82

5.3.4 Mulliken-Jaffe Electronegativity

0.730.62

0.62 2.48

5.3.5 Allen Electronegativity

0.730.66

0.659 2.7

5.4 Electropositivity

5.4.1 Pauling Electropositivity

3.183.21

1.46 3.3

5.5 Ionization Energies

5.5.1 1st Energy Level

418.80 kJ/mol375.70 kJ/mol

375.7 26130

5.5.2 2nd Energy Level

3,052.00 kJ/mol2,234.30 kJ/mol

710.2162 28750

5.5.3 3rd Energy Level

4,420.00 kJ/mol3,400.00 kJ/mol

1600 34230

5.5.4 4th Energy Level

5,877.00 kJ/molNA

2780 37066

5.5.5 5th Energy Level

7,975.00 kJ/molNA

4305.2 97510

5.5.6 6th Energy Level

9,590.00 kJ/molNA

5715.8 105800

5.5.7 7th Energy level

11,343.00 kJ/molNA

7226.8 114300

5.5.8 8th Energy Level

14,944.00 kJ/molNA

8857.4 125300

5.5.9 9th Energy Level

16,963.70 kJ/molNA

14110 134700

5.5.10 10th Energy Level

48,610.00 kJ/molNA

17100 144300

5.5.11 11th Energy Level

54,490.00 kJ/molNA

19900 169988

5.5.12 12th Energy Level

60,730.00 kJ/molNA

22219 189368

5.5.13 13th Energy Level

68,950.00 kJ/molNA

26930 76015

5.5.14 14th Energy Level

75,900.00 kJ/molNA

29196 86450

5.5.15 15th Energy Level

83,080.00 kJ/molNA

41987 97510

5.5.16 16th Energy Level

93,400.00 kJ/molNA

47206 109480

5.5.17 17th Energy Level

99,710.00 kJ/molNA

52737 122200

5.5.18 18th Energy Level

NANA

58570 134810

5.5.19 19th Energy Level

NANA

64702 148700

5.5.20 20th Energy Level

NANA

80400 171200

5.5.21 21st Energy Level

NANA

87000 179100

5.5.22 22nd Energy Level

NANA

93400 184900

5.5.23 23rd Energy Level

NANA

98420 198800

5.5.24 24th Energy Level

NANA

104400 195200

5.5.25 25th Energy Level

NANA

121900 121900

5.5.26 26th Energy Level

NANA

127700 127700

5.5.27 27th Energy Level

NANA

133800 133800

5.5.28 28th Energy Level

NANA

139800 139800

5.5.29 29th Energy Level

NANA

148100 148100

5.5.30 30th Energy Level

NANA

154500 154500

5.6 Electrochemical Equivalent

1.46 g/amp-hr4.96 g/amp-hr

0.16812 8.3209

5.7 Electron Work Function

2.30 eV2.14 eV

2.14 5.65

5.8 Other Chemical Properties

Chemical Stability, Flammability, Ionization, Solubility

Chemical Stability, Corrosion, Ionization, Radioactive Isotopes, Solubility

6 Atomic

6.1 Atomic Number

1955

3 117

6.2 Electron Configuration

[Ar] 4s¹

[Xe] 6s¹

6.3 Crystal Structure

Body Centered Cubic (BCC)

6.3.1 Crystal Lattice

6.4 Atom

6.4.1 Number of Protons

1955

3 117

6.4.2 Number of Neutrons

2078

4 184

6.4.3 Number of Electrons

1955

3 117

6.5 Radius of an Atom

6.5.1 Atomic Radius

227.00 pm265.00 pm

112 265

6.5.2 Covalent Radius

203.00 pm244.00 pm

96 260

6.5.3 Van der Waals Radius

275.00 pm343.00 pm

139 348

6.6 Atomic Weight

39.10 amu132.91 amu

6.94 294

6.7 Atomic Volume

45.46 cm3/mol71.07 cm3/mol

1.39 71.07

6.8 Adjacent Atomic Numbers

6.8.1 Previous Element

6.8.2 Next Element

6.9 Valence Electron Potential

10.40 (-eV)8.62 (-eV)

8 392.42

6.10 Lattice Constant

532.80 pm614.10 pm

228.58 891.25

6.11 Lattice Angles

π/2, π/2, π/2

6.12 Lattice C/A Ratio

NANA

1.567 1.886

7 Mechanical

7.1 Density

7.1.1 Density At Room Temperature

0.86 g/cm³1.93 g/cm³

0.534 40.7

7.1.2 Density When Liquid (at m.p.)

0.83 g/cm31.84 g/cm3

0.512 20

7.2 Tensile Strength

NANA

2.5 11000

7.3 Viscosity

NANA

0.001526 0.001526

7.4 Vapor Pressure

7.4.1 Vapor Pressure at 1000 K

NANA

2.47E-11 121

7.4.2 Vapor Pressure at 2000 K

NANA

2.62E-10 774

7.5 Elasticity properties

7.5.1 Shear Modulus

1.30 GPaNA

1.3 222

7.5.2 Bulk Modulus

3.10 GPa1.60 GPa

1.6 462

7.5.3 Young's Modulus

3.53 GPa1.70 GPa

1.7 528

7.6 Poisson Ratio

NANA

0.032 0.47

7.7 Other Mechanical Properties

Ductile

8 Magnetic

8.1 Magnetic Characteristics

8.1.1 Specific Gravity

0.861.87

0.53 4500

8.1.2 Magnetic Ordering

Paramagnetic

8.1.3 Permeability

NANA

1.25643E-06 0.0063

8.1.4 Susceptibility

NANA

-0.000166 200000

8.2 Electrical Properties

8.2.1 Electrical Property

Conductor

Semiconductor

8.2.2 Resistivity

72.00 nΩ·m205.00 nΩ·m

0.18 961

8.2.3 Electrical Conductivity

0.14 10⁶/cm Ω0.05 10⁶/cm Ω

0.00666 0.63

8.2.4 Electron Affinity

48.40 kJ/mol45.50 kJ/mol

0 222.8

9 Thermal

9.1 Specific Heat

0.75 J/(kg K)0.24 J/(kg K)

0.11 3.6

9.2 Molar Heat Capacity

29.60 J/mol·K32.21 J/mol·K

16.443 62.7

9.3 Thermal Conductivity

102.50 W/m·K35.90 W/m·K

6.3 429

9.4 Critical Temperature

2,223.00 K1,938.00 K

26.3 3223

9.5 Thermal Expansion

83.30 µm/(m·K)97.00 µm/(m·K)

4.5 97

9.6 Enthalpy

9.6.1 Enthalpy of Vaporization

77.50 kJ/mol65.90 kJ/mol

7.32 799.1

9.6.2 Enthalpy of Fusion

2.32 kJ/mol2.10 kJ/mol

2.1 35.23

9.6.3 Enthalpy of Atomization

89.50 kJ/mol78.20 kJ/mol

61.5 837

9.7 Standard Molar Entropy

64.70 J/mol.K85.20 J/mol.K

9.5 198.1

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