Lanthanum (La) in the periodic table — PeriodicTable

Lanthanum (La) in the periodic tableLanthanum is element 57, a lanthanoid of the f block, in period 6. Its ground-state configuration is [Xe] 5d1 6s2, and it usually shows the oxidation states 0, 3.It was discovered in 1839, by Mosander.Name origin: the Greek lanthanein, 'to lie hidden'. Blank rows are columns the sheet does not measure for this element.

Property

Value

Unit

Atomic weight

138.90547

Da

Electronegativity

1.1

First ionisation energy

538.1

kJ/mol

Covalent radius

169

pm

Melting point

1193

K

Boiling point

3737

K

Density

6.145

g/cm³

Abundance

39

mg/kg

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