La - Lanthanum - periodic table of the elements

The placement of lanthanum in the d block instead of the f block of the table is controversial, and it may be changed, pending a review of the data. The element was discovered by Mosander in 1839 in Sweden.

Atomic number	-	57		Density	g/mL	6	.7
Atomic weight	u	138	.9055	Melting point	K	1193
Bonding radius	A	1	.69	Boiling point	K	3730
Atomic radius	A	2	.74	Heat of vaporization	kJ/mol	414
Ionization Potential	V	5	.58	Heat of fusion	kJ/mol	6	.2
Electronegativity	-	1	.1	Specific heat	J/gK	0	.19
The oxide is a strong base.				Crystal are hexagonal.
Electron configuration: [Xe] 5d¹ 6s²

Other elements of the periodic table

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

H He

Li Be B C N O F Ne

Na Mg Al Si P S Cl Ar

K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr

Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe

Cs Ba La * Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn

Fr Ra Ac ** Rf Db Sg Bh Hs Mt 110 111 112 113

Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu

Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr