Tantalum

Overview

English Name:

Tantalum

Latin Name:

Tantalum

Year Discovered:

1802

Discovered By:

Anders Gustav Ekeberg

Group:

5

Period:

6

Electrons:

73

CAS Number:

7440-25-7

Cost Per 100 Grams:

$250

Atomic Properties

Electronic Configuration:

[Xe] 4f¹⁴ 5d³ 6s²

Ion Charge:

+5

Ionisation Energies:

761 kJ/mol

Atomic Radius (Empirical):

143 pm

Atomic Radius (Calculated):

217 pm

Covalent Radius:

146 pm

Van Der Waals Radius:

N/A

Ionisation Potential of An Atom:

7.86 eV

Electrons Per Layer:

2, 8, 18, 32, 13

Atomic Multiplicities Of The Gas:

1

Atomic Weight:

180.95

Reactivity

Electron Affinity:

0.0 kJ/mol

Valence:

5

Electronegativity:

1.5

Thermal Properties

Melting Point:

3017°C

Boiling Point:

5458°C

Critical Point:

Pressure: N/A

Temperature: N/A

Thermal Conductivity:

57 W/(m·K)

Heat Capacity:

Specific: 0.23 J/(g·K)

Molar: 25.3 J/(mol·K)

Thermal Coefficient:

0.000006

Enthalpy:

Fusion: 35.1 kJ/mol

Vaporisation: 400 kJ/mol

Atomization: N/A

Curie Temperature:

N/A

Neel Temperature:

N/A

Superconductivity Point:

N/A

Physical and Chemical Properties

State of matter (25° C/ 77°F):

Solid

Density:

Solid: 16.65 g/cm³

Molar Volume (Vmol):

10.87 cm³/mol

Speed of Sound (Vs):

3320 m/s

Hardness:

6.5

Bulk Modulus (K):

150 GPa

Shear Modulus (G):

45 GPa

Young's Modulus (E):

200 GPa

Color:

Gray

Brinell Hardness (MPa):

1500

Liquid Density (Kg/m^3):

N/A

Hardness of Mohs:

6.5

Refractive Index:

N/A

Vickers Hardness (MPa):

N/A

Crystal Structure:

Body-centered cubic (BCC)

Electromagnetic Properties

Electrical Type:

Conductor

Resistivity:

1.6 × 10^-7 Ω·m

Magnetic Type:

Paramagnetic

Superconductivity:

Not applicable

Volume Magnetic Susceptibility:

0.0 × 10^-6

Mass Magnetic Susceptibility:

0.0 × 10^-6 m³/kg

Molar Mass Susceptibility:

0.0 × 10^-6 m³/mol

Electrical Conductivity:

6.0 × 10^6 S/m

Mass (γ_mass):

1.0 × 10^-25 kg

Mass (γ_mol):

1.0 × 10^-22 mol

Volume (γ_vol):

10.87 L

Grid Parameters

Crystal Structure:

Body-centered cubic (BCC)

Grid Parameters:

a = 330 pm

Attitude:

N/A

Debye Temperature:

N/A

Safety and Precautions

Signal Word:

Warning

Hazard Statements:

H228

Precautionary Statements:

P220, P244, P370 + P376

RTECS Number:

Not available

Risk:

Flammability: Flammable solid
Health Risk: Irritant
Reactivity: Stable
Specific Risk: None

Importance

Main sources:

Minerals, ores

Main Usage:

Electronics, capacitors

Nuclear Properties

Radioactive:

No

Isotopes:

Ta-180, Ta-181

Neutron Cross Sectional:

0.015 barns

Half Life (s):

None

Lifetime:

Stable

Prevalence

Universe:

0.0002%

Sun:

0.0002%

Oceans:

0.0%

Humans:

0.0%

Earth's Crust:

0.0001%

Meteorites:

0.0001%