Rhodium

Potassium

Rhodium Potassium Comparison

Rhodium

Potassium

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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

d block

s block

1.5 Element Family

Transition Metal

Alkali

1.6 CAS Number

74401667440097

7429905 54386242

1.7 Space Group Name

Fm_ 3m

Im_ 3m

1.8 Space Group Number

225.00229.00

11 229

2 Facts

2.1 Interesting Facts

Rhodium is the rarest element out of all non-radioactive metals on the earth .
Rhodium is one of the most durable and hard metal, which also have high reflectance.

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

2.2 Sources

Earth's crust, Found As a By-product, Found in Minerals, Mining

Found in Minerals, Mining

2.3 History

2.3.1 Who Discovered

William Hyde Wollaston

Humphry Davy

2.3.2 Discovery

In 1804

In 1807

2.4 Abundance

2.4.1 Abundance In Universe

6 * 10^-8 %3 * 10^-4 %

5E-09 0.11

2.4.2 Abundance In Sun

~0.0000002 %~0.0004 %

1E-08 0.1

2.4.3 Abundance In Meteorites

0.00 %0.07 %

1.7E-07 22

2.4.4 Abundance In Earth's Crust

0.00 %1.50 %

9.9E-12 8.1

2.4.5 Abundance In Oceans

NA0.04 %

2E-23 1.1

2.4.6 Abundance In Humans

NA0.20 %

1E-13 1.4

3 Uses

3.1 Uses & Benefits

Rhodium metal is mainly used in catalytic converters for cars as it reduces nitrogen oxides in exhaust gases.

It is used as an industrial catalyst for nitric acid, acetic acid, hydrogenation reaction, etc.

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.

3.1.1 Industrial Uses

Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry

Ammunition Industry, Chemical Industry

3.1.2 Medical Uses

Pharmaceutical Industry

3.1.3 Other Uses

Alloys

3.2 Biological Properties

3.2.1 Toxicity

Toxic

3.2.2 Present in Human Body

✔ ✘

3.2.3 In Blood

NA1,620.00 Blood/mg dm-3

0 1970

3.2.4 In Bone

NA2,100.00 p.p.m.

0 170000

4 Physical

4.1 Melting Point

1,966.00 °C63.65 °C

27 3410

4.2 Boiling Point

3,727.00 °C774.00 °C

147 5660

4.3 Appearance

4.3.1 Physical State

Solid

4.3.2 Color

Silvery White

Silvery Gray

4.3.3 Luster

Metallic

4.4 Hardness

4.4.1 Mohs Hardness

6.000.40

0.2 8.5

4.4.2 Brinell Hardness

980.00 MPa0.36 MPa

0.14 3490

4.4.3 Vickers Hardness

1,100.00 MPaNA

121 3430

4.5 Speed of Sound

4,700.00 m/s2,000.00 m/s

818 16200

4.6 Optical Properties

4.6.1 Refractive Index

NANA

1.000933 1.7229

4.6.2 Reflectivity

84.00 %NA

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

1620

0 38

5.3 Electronegativity

5.3.1 Pauling Electronegativity

2.280.82

0.7 2.54

5.3.2 Sanderson Electronegativity

NA0.45

0.22 2.56

5.3.3 Allred Rochow Electronegativity

1.450.91

0.86 1.82

5.3.4 Mulliken-Jaffe Electronegativity

NA0.73

0.62 2.48

5.3.5 Allen Electronegativity

1.560.73

0.659 2.7

5.4 Electropositivity

5.4.1 Pauling Electropositivity

1.723.18

1.46 3.3

5.5 Ionization Energies

5.5.1 1st Energy Level

719.70 kJ/mol418.80 kJ/mol

375.7 26130

5.5.2 2nd Energy Level

1,740.00 kJ/mol3,052.00 kJ/mol

710.2162 28750

5.5.3 3rd Energy Level

2,997.00 kJ/mol4,420.00 kJ/mol

1600 34230

5.5.4 4th Energy Level

NA5,877.00 kJ/mol

2780 37066

5.5.5 5th Energy Level

NA7,975.00 kJ/mol

4305.2 97510

5.5.6 6th Energy Level

NA9,590.00 kJ/mol

5715.8 105800

5.5.7 7th Energy level

NA11,343.00 kJ/mol

7226.8 114300

5.5.8 8th Energy Level

NA14,944.00 kJ/mol

8857.4 125300

5.5.9 9th Energy Level

NA16,963.70 kJ/mol

14110 134700

5.5.10 10th Energy Level

NA48,610.00 kJ/mol

17100 144300

5.5.11 11th Energy Level

NA54,490.00 kJ/mol

19900 169988

5.5.12 12th Energy Level

NA60,730.00 kJ/mol

22219 189368

5.5.13 13th Energy Level

NA68,950.00 kJ/mol

26930 76015

5.5.14 14th Energy Level

NA75,900.00 kJ/mol

29196 86450

5.5.15 15th Energy Level

NA83,080.00 kJ/mol

41987 97510

5.5.16 16th Energy Level

NA93,400.00 kJ/mol

47206 109480

5.5.17 17th Energy Level

NA99,710.00 kJ/mol

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

1.28 g/amp-hr1.46 g/amp-hr

0.16812 8.3209

5.7 Electron Work Function

4.98 eV2.30 eV

2.14 5.65

5.8 Other Chemical Properties

Anti Corrosion, Ionization, Radioactive Isotopes

Chemical Stability, Flammability, Ionization, Solubility

6 Atomic

6.1 Atomic Number

4519

3 117

6.2 Electron Configuration

[Kr] 4d⁸ 5s¹

[Ar] 4s¹

6.3 Crystal Structure

Face Centered Cubic (FCC)

Body Centered Cubic (BCC)

6.3.1 Crystal Lattice

6.4 Atom

6.4.1 Number of Protons

4519

3 117

6.4.2 Number of Neutrons

5820

4 184

6.4.3 Number of Electrons

4519

3 117

6.5 Radius of an Atom

6.5.1 Atomic Radius

134.00 pm227.00 pm

112 265

6.5.2 Covalent Radius

142.00 pm203.00 pm

96 260

6.5.3 Van der Waals Radius

200.00 pm275.00 pm

139 348

6.6 Atomic Weight

102.91 amu39.10 amu

6.94 294

6.7 Atomic Volume

8.30 cm3/mol45.46 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

64.00 (-eV)10.40 (-eV)

8 392.42

6.10 Lattice Constant

380.34 pm532.80 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

12.41 g/cm³0.86 g/cm³

0.534 40.7

7.1.2 Density When Liquid (at m.p.)

10.70 g/cm30.83 g/cm3

0.512 20

7.2 Tensile Strength

951.00 MPaNA

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

1.12.1 Vapor Pressure at 2000 K

0.02 (Pa)NA

2.62E-10 774

1.13 Elasticity properties

1.13.1 Shear Modulus

150.00 GPa1.30 GPa

1.3 222

1.13.2 Bulk Modulus

275.00 GPa3.10 GPa

1.6 462

1.13.3 Young's Modulus

380.00 GPa3.53 GPa

1.7 528

1.14 Poisson Ratio

0.26NA

0.032 0.47

1.15 Other Mechanical Properties

Malleable

2 Magnetic

2.1 Magnetic Characteristics

2.1.1 Specific Gravity

12.410.86

0.53 4500

2.1.2 Magnetic Ordering

Paramagnetic

2.1.3 Permeability

NANA

1.25643E-06 0.0063

2.1.4 Susceptibility

NANA

-0.000166 200000

2.2 Electrical Properties

2.2.1 Electrical Property

Conductor

2.2.2 Resistivity

43.30 nΩ·m72.00 nΩ·m

0.18 961

2.2.3 Electrical Conductivity

0.21 10⁶/cm Ω0.14 10⁶/cm Ω

0.00666 0.63

2.2.4 Electron Affinity

109.70 kJ/mol48.40 kJ/mol

0 222.8

3 Thermal

3.1 Specific Heat

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

0.11 3.6

3.2 Molar Heat Capacity

24.98 J/mol·K29.60 J/mol·K

16.443 62.7

3.3 Thermal Conductivity

150.00 W/m·K102.50 W/m·K

6.3 429

3.4 Critical Temperature

NA2,223.00 K

26.3 3223

3.5 Thermal Expansion

8.20 µm/(m·K)83.30 µm/(m·K)

4.5 97

3.6 Enthalpy

3.6.1 Enthalpy of Vaporization

495.40 kJ/mol77.50 kJ/mol

7.32 799.1

3.6.2 Enthalpy of Fusion

21.76 kJ/mol2.32 kJ/mol

2.1 35.23

3.6.3 Enthalpy of Atomization

556.50 kJ/mol89.50 kJ/mol

61.5 837

3.7 Standard Molar Entropy

31.50 J/mol.K64.70 J/mol.K

9.5 198.1

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