Element 57 - Lanthanum / Lanthanum

(Latin / English)

Mass Number

Atomic Mass

% Abundance

Nuclear Spin

138 *

137.9071

0.09

5+

139

138.9063

99.91

7/2+

140 *

139.9095

0

3-

(* = unstable isotope)

Mass Number	Atomic Mass	% Abundance	Nuclear Spin
138 *	137.9071	0.09	5+
139	138.9063	99.91	7/2+
140 *	139.9095	0	3-

Electron Configuration:

[Xe] 5d¹ 6s²

Relative Atomic Mass:

138.91

State (25°C, 1 atm):

solid, metal

Density:

6145 kg/m³

Melting Temperature:

1194 K

Boiling Temperature:

3730 K

Electron Configuration:	[Xe] 5d¹ 6s²
Relative Atomic Mass:	138.91
State (25°C, 1 atm):	solid, metal
Density:	6145 kg/m³
Melting Temperature:	1194 K
Boiling Temperature:	3730 K