Neptunium

Chromium

Neptunium vs Chromium

Neptunium

Chromium

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1 Periodic Table

1.1 Symbol

1.2 Group Number

NA6

0 17

1.3 Period Number

2 7

1.4 Block

f block

d block

1.5 Element Family

Actinide

Transition Metal

1.6 CAS Number

74399987440473

7429905 54386242

1.7 Space Group Name

Pnma

Im_ 3m

1.8 Space Group Number

62.00229.00

11 229

2 Facts

2.1 Interesting Facts

Not Available

Chromium is highly reactive, hence it is not found free in nature.

Ores of Chromites mineral are the major source of Chromium metal.

Almost 90% leather tanning is done with the help of chromium.

2.2 Sources

Made by Bombarding Uranium with Neutrons, Ores of metals

Found in Minerals, Mining, Ores of metals, Ores of Minerals

2.3 History

2.3.1 Who Discovered

Edwin McMillan and Philip H. Abelson

Louis Nicolas Vauquelin

2.3.2 Discovery

In 1940

In Between 1797 - 1798

2.4 Abundance

2.4.1 Abundance In Universe

NA1.5 * 10^-3 %

5E-09 0.11

2.4.2 Abundance In Sun

~-9999 %~0.002 %

1E-08 0.1

2.4.3 Abundance In Meteorites

NA0.30 %

1.7E-07 22

2.4.4 Abundance In Earth's Crust

NA0.01 %

9.9E-12 8.1

2.4.5 Abundance In Oceans

NA0.00 %

2E-23 1.1

2.4.6 Abundance In Humans

NA0.00 %

1E-13 1.4

3 Uses

3.1 Uses & Benefits

Currently known uses of Neptunium metal are limited to research purpose only.
Neptunium’s isotope neptunium-237 is used as a neutron detectors.

It is used to harden the steel and produces a stainless steel and other various alloys.
It is also used to give proper finish to polished mirrors. Its chromium plates are used in bathroom fittings.

3.1.1 Industrial Uses

Automobile Industry, Chemical Industry

3.1.2 Medical Uses

3.1.3 Other Uses

Alloys, Nuclear Research, Research Purposes

Alloys

3.2 Biological Properties

3.2.1 Toxicity

Toxic

Highly Toxic

3.2.2 Present in Human Body

✔ ✘

3.2.3 In Blood

0.00 Blood/mg dm-30.11 Blood/mg dm-3

0 1970

3.2.4 In Bone

0.00 p.p.m.0.33 p.p.m.

0 170000

4 Physical

4.1 Melting Point

640.00 °C1,857.00 °C

27 3410

4.2 Boiling Point

3,902.00 °C2,672.00 °C

147 5660

4.3 Appearance

4.3.1 Physical State

Solid

4.3.2 Color

Silver

4.3.3 Luster

Metallic

4.4 Hardness

4.4.1 Mohs Hardness

NA8.50

0.2 8.5

4.4.2 Brinell Hardness

NA687.00 MPa

0.14 3490

4.4.3 Vickers Hardness

NA1,060.00 MPa

121 3430

4.5 Speed of Sound

NA5,940.00 m/s

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

2021

0 38

5.3 Electronegativity

5.3.1 Pauling Electronegativity

1.361.66

0.7 2.54

5.3.2 Sanderson Electronegativity

NA1.66

0.22 2.56

5.3.3 Allred Rochow Electronegativity

1.221.56

0.86 1.82

5.3.4 Mulliken-Jaffe Electronegativity

NANA

0.62 2.48

5.3.5 Allen Electronegativity

NA1.65

0.659 2.7

5.4 Electropositivity

5.4.1 Pauling Electropositivity

2.642.34

1.46 3.3

5.5 Ionization Energies

5.5.1 1st Energy Level

604.50 kJ/mol26,130.00 kJ/mol

375.7 26130

5.5.2 2nd Energy Level

1,128.00 kJ/mol28,750.00 kJ/mol

710.2162 28750

5.5.3 3rd Energy Level

1,997.00 kJ/mol34,230.00 kJ/mol

1600 34230

5.5.4 4th Energy Level

3,242.00 kJ/mol37,066.00 kJ/mol

2780 37066

5.5.5 5th Energy Level

NA97,510.00 kJ/mol

4305.2 97510

5.5.6 6th Energy Level

NA105,800.00 kJ/mol

5715.8 105800

5.5.7 7th Energy level

NA114,300.00 kJ/mol

7226.8 114300

5.5.8 8th Energy Level

NA125,300.00 kJ/mol

8857.4 125300

5.5.9 9th Energy Level

NA134,700.00 kJ/mol

14110 134700

5.5.10 10th Energy Level

NA144,300.00 kJ/mol

17100 144300

5.5.11 11th Energy Level

NA26,130.00 kJ/mol

19900 169988

5.5.12 12th Energy Level

NA28,750.00 kJ/mol

22219 189368

5.5.13 13th Energy Level

NA34,230.00 kJ/mol

26930 76015

5.5.14 14th Energy Level

NA37,066.00 kJ/mol

29196 86450

5.5.15 15th Energy Level

NA97,510.00 kJ/mol

41987 97510

5.5.16 16th Energy Level

NA105,800.00 kJ/mol

47206 109480

5.5.17 17th Energy Level

NA114,300.00 kJ/mol

52737 122200

5.5.18 18th Energy Level

NA125,300.00 kJ/mol

58570 134810

5.5.19 19th Energy Level

NA134,700.00 kJ/mol

64702 148700

5.5.20 20th Energy Level

NA144,300.00 kJ/mol

80400 171200

5.5.21 21st Energy Level

NA157,700.00 kJ/mol

87000 179100

5.5.22 22nd Energy Level

NA166,090.00 kJ/mol

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

1.77 g/amp-hr0.32 g/amp-hr

0.16812 8.3209

5.7 Electron Work Function

NA4.50 eV

2.14 5.65

5.8 Other Chemical Properties

Ionization, Radioactive Isotopes, Radioactivity, Solubility

Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility

6 Atomic

6.1 Atomic Number

9324

3 117

6.2 Electron Configuration

[Rn] 5f⁴ 6d¹ 7s²

[Ar] 3d⁵ 4s¹

6.3 Crystal Structure

Orthorhombic (ORTH)

Body Centered Cubic (BCC)

6.3.1 Crystal Lattice

6.4 Atom

6.4.1 Number of Protons

9324

3 117

6.4.2 Number of Neutrons

14428

4 184

6.4.3 Number of Electrons

9324

3 117

6.5 Radius of an Atom

6.5.1 Atomic Radius

155.00 pm128.00 pm

112 265

6.5.2 Covalent Radius

190.00 pm139.00 pm

96 260

6.5.3 Van der Waals Radius

221.00 pm200.00 pm

139 348

6.6 Atomic Weight

237.00 amu52.00 amu

6.94 294

6.7 Atomic Volume

11.62 cm3/mol7.23 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

96.00 (-eV)170.00 (-eV)

8 392.42

6.10 Lattice Constant

666.30 pm291.00 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

19.38 g/cm³7.19 g/cm³

0.534 40.7

7.1.2 Density When Liquid (at m.p.)

NA6.30 g/cm3

0.512 20

7.2 Tensile Strength

125.00 MPa689.00 MPa

2.5 11000

7.3 Viscosity

NANA

0.001526 0.001526

7.4 Vapor Pressure

7.4.1 Vapor Pressure at 1000 K

NA0.00 (Pa)

2.47E-11 121

7.4.2 Vapor Pressure at 2000 K

0.11 (Pa)774.00 (Pa)

2.62E-10 774

7.5 Elasticity properties

7.5.1 Shear Modulus

NA115.00 GPa

1.3 222

7.5.2 Bulk Modulus

NA160.00 GPa

1.6 462

7.5.3 Young's Modulus

NA279.00 GPa

1.7 528

7.6 Poisson Ratio

NA0.21

0.032 0.47

7.7 Other Mechanical Properties

Ductile

8 Magnetic

8.1 Magnetic Characteristics

8.1.1 Specific Gravity

20.257.19

0.53 4500

8.1.2 Magnetic Ordering

Paramagnetic

Antiferromagnetic

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

8.2.2 Resistivity

1.22 nΩ·m125.00 nΩ·m

0.18 961

8.2.3 Electrical Conductivity

0.01 10⁶/cm Ω0.08 10⁶/cm Ω

0.00666 0.63

8.2.4 Electron Affinity

NA64.30 kJ/mol

0 222.8

9 Thermal

9.1 Specific Heat

0.12 J/(kg K)0.45 J/(kg K)

0.11 3.6

9.2 Molar Heat Capacity

29.46 J/mol·K23.35 J/mol·K

16.443 62.7

9.3 Thermal Conductivity

6.30 W/m·K93.90 W/m·K

6.3 429

9.4 Critical Temperature

NANA

26.3 3223

9.5 Thermal Expansion

NA4.90 µm/(m·K)

4.5 97

9.6 Enthalpy

9.6.1 Enthalpy of Vaporization

NA348.80 kJ/mol

7.32 799.1

9.6.2 Enthalpy of Fusion

3.20 kJ/mol15.31 kJ/mol

2.1 35.23

9.6.3 Enthalpy of Atomization

NA397.50 kJ/mol

61.5 837

9.7 Standard Molar Entropy

NA23.80 J/mol.K

9.5 198.1

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