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Atomic Number: 90
Th
Th

Thorium

232.0400 u

Category

actinide

State at Room Temperature

solid

Electron Configuration

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 6d²

Valence Electrons

2

Lewis Dot:••

Electronegativity

1.3

Pauling scale

Oxidation States

+4

Melting Point

2023 K

1749.85°C

Boiling Point

5061 K

4787.85°C

Density

11.724

g/cm³

Position in Table

Group Period 7f-block

Discovery

Historical Information

Discovered byJöns Jacob Berzelius
Year1828

Common Uses

Applications & Industries

Nuclear reactors, gas mantles, welding electrodes, ceramics

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