Uranium

Uranium is a chemical element with the symbol U and atomic number 92. It is a dense, silvery-white metal that is weakly radioactive. Uranium is used as fuel for nuclear reactors and in the manufacture of nuclear weapons. It is the heaviest naturally occurring element.

Overview

English Name:

Uranium

Latin Name:

Uranium

Year Discovered:

1789

Discovered By:

Martin Heinrich Klaproth

Group:

Actinides

Period:

Electrons:

CAS Number:

7440-61-1

Cost Per 100 Grams:

$100

Atomic Properties

Electronic Configuration:

[Rn] 5f³ 6d¹ 7s²

Ion Charge:

+3, +4, +5, +6

Ionisation Energies:

607 kJ/mol

Atomic Radius (Empirical):

175 pm

Atomic Radius (Calculated):

186 pm

Covalent Radius:

156 pm

Van Der Waals Radius:

N/A

Ionisation Potential of An Atom:

6.194 eV

Electrons Per Layer:

2, 8, 18, 32, 21, 9, 2

Atomic Multiplicities Of The Gas:

Atomic Weight:

238.02891

Oxidation States

Reactivity

Electron Affinity:

Not well defined

Valence:

Electronegativity:

1.38

Thermal Properties

Melting Point:

1,132 °C

Boiling Point:

4131 °C

Critical Point:

Pressure: N/A

Temperature: N/A

Thermal Conductivity:

27 W/(m·K)

Heat Capacity:

Specific: 0.11 J/(g·K)

Molar: 27.66 J/(mol·K)

Thermal Coefficient:

0.0001

Enthalpy:

Fusion: 8.4 kJ/mol

Vaporisation: 300 kJ/mol

Atomization: 400 kJ/mol

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: 18.95 g/cm³

Molar Volume (Vmol):

12.55 cm³/mol

Speed of Sound (Vs):

Not applicable

Hardness:

N/A

Bulk Modulus (K):

Not available

Shear Modulus (G):

N/A

Young's Modulus (E):

N/A

Color:

Silvery-gray

Brinell Hardness (MPa):

N/A

Liquid Density (Kg/m^3):

10.5 kg/m³

Hardness of Mohs:

N/A

Refractive Index:

N/A

Vickers Hardness (MPa):

N/A

Crystal Structure:

Orthorhombic

Electromagnetic Properties

Electrical Type:

Conductor

Resistivity:

10^-7 Ω·m

Magnetic Type:

Paramagnetic

Superconductivity:

Not applicable

Volume Magnetic Susceptibility:

-1.0 × 10^-9

Mass Magnetic Susceptibility:

-1.2 × 10^-9 m³/kg

Molar Mass Susceptibility:

-3.0 × 10^-8 m³/mol

Electrical Conductivity:

10^-6 S/m

Mass (γ_mass):

3.8 × 10^-25 kg

Mass (γ_mol):

3.8 × 10^-22 mol

Volume (γ_vol):

12.55 L

Grid Parameters

Crystal Structure:

Orthorhombic

Grid Parameters:

N/A

Attitude:

N/A

Debye Temperature:

N/A

Safety and Precautions

Signal Word:

Danger

Hazard Statements:

H300, H310, H330

Precautionary Statements:

P201, P202, P280, P308 + P313

RTECS Number:

Not available

Risk:

Flammability: Non-flammable
Health Risk: Highly toxic
Reactivity: Unstable
Specific Risk: Radioactive

Importance

Main sources:

Uranium ores

Main Usage:

Nuclear fuel, research

Nuclear Properties

Radioactive:

Yes

Isotopes:

U-238, U-235

Neutron Cross Sectional:

1.0 barns

Half Life (s):

4.468 billion years

Lifetime:

Stable

Prevalence

Universe:

0.0000000001%

Sun:

0.0000000001%

Oceans:

0.00000000001%

Humans:

0.000000000001%

Earth's Crust:

0.0000000001%

Meteorites:

0.0000000001%