57 La 138.91

Lanthanum

Category: Lanthanide | State: Solid

Atomic Properties

Atomic Number 57
Atomic Mass 138.91
Electronic Configuration [Xe] 5d¹ 6s²

Periodic Table Placement

Group N/A
Period 6
Block f-block

Physical Properties & Discovery

Melting Point 920°C
Boiling Point 3464°C
Density 6.145 g/cm³
Discovered By Carl Gustaf Mosander (1839)

Frequently Asked Questions about Lanthanum