Rhenium

Rhenium is a chemical element with the symbol Re and atomic number 75. It is a rare, silvery-gray, heavy, third-row transition metal. Rhenium has the third-highest melting point of any element, exceeded only by carbon and tungsten. Rhenium is used in superalloys, catalysts, and electronics.

Overview

English Name:

Rhenium

Latin Name:

Rhenium

Year Discovered:

1925

Discovered By:

Walter Noddack, Ida Tacke, Otto Berg

Group:

Period:

Electrons:

CAS Number:

7440-15-5

Cost Per 100 Grams:

$5,000

Atomic Properties

Electronic Configuration:

[Xe] 4f¹⁴ 5d⁵ 6s²

Ion Charge:

+4, +6

Ionisation Energies:

760 kJ/mol

Atomic Radius (Empirical):

137 pm

Atomic Radius (Calculated):

188 pm

Covalent Radius:

151 pm

Van Der Waals Radius:

N/A

Ionisation Potential of An Atom:

7.87 eV

Electrons Per Layer:

2, 8, 18, 32, 13, 2

Atomic Multiplicities Of The Gas:

Atomic Weight:

186.21

Oxidation States

Reactivity

Electron Affinity:

0.0 kJ/mol

Valence:

4, 6

Electronegativity:

1.9

Thermal Properties

Melting Point:

3186°C

Boiling Point:

5596°C

Critical Point:

Pressure: N/A

Temperature: N/A

Thermal Conductivity:

48 W/(m·K)

Heat Capacity:

Specific: 0.14 J/(g·K)

Molar: 25.48 J/(mol·K)

Thermal Coefficient:

0.000006

Enthalpy:

Fusion: 33.2 kJ/mol

Vaporisation: 705 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: 21.02 g/cm³

Molar Volume (Vmol):

8.86 cm³/mol

Speed of Sound (Vs):

4700 m/s

Hardness:

Bulk Modulus (K):

370 GPa

Shear Modulus (G):

178 GPa

Young's Modulus (E):

463 GPa

Color:

Silvery-gray

Brinell Hardness (MPa):

2450

Liquid Density (Kg/m^3):

N/A

Hardness of Mohs:

Refractive Index:

N/A

Vickers Hardness (MPa):

N/A

Crystal Structure:

Hexagonal close-packed (hcp)

Electromagnetic Properties

Electrical Type:

Conductor

Resistivity:

1.9 × 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:

5.2 × 10^6 S/m

Mass (γ_mass):

1.0 × 10^-25 kg

Mass (γ_mol):

1.0 × 10^-22 mol

Volume (γ_vol):

8.86 L

Grid Parameters

Crystal Structure:

Hexagonal close-packed (hcp)

Grid Parameters:

a = 276.1 pm, c = 428.2 pm

Attitude:

c/a = 1.550

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:

Superalloys, catalysts

Nuclear Properties

Radioactive:

Isotopes:

Re-185, Re-187

Neutron Cross Sectional:

0.0 barns

Half Life (s):

None

Lifetime:

Stable

Prevalence

Universe:

0.0001%

Sun:

0.0001%

Oceans:

0.0%

Humans:

0.0%

Earth's Crust:

0.0001%

Meteorites:

0.0001%