Thorium (Th) in the periodic table — PeriodicTable

Thorium (Th) in the periodic tableThorium is element 90, an actinoid of the f block, in period 7. Its ground-state configuration is [Rn] 6d2 7s2, and it usually shows the oxidation states 0, 4.It was discovered in 1829, by Berzelius.Name origin: Thor, the Scandinavian god of thunder. Blank rows are columns the sheet does not measure for this element.

Property

Value

Unit

Atomic weight

232.03806

Da

Electronegativity

1.3

First ionisation energy

587

kJ/mol

Melting point

2115

K

Boiling point

5061

K

Density

11.72

g/cm³

Abundance

9.6

mg/kg

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