Er - Erbium - periodic table of the elements

A rare earth metal, discovered by Mosander in 1842.

Atomic number	-	68		Density	g/mL	9	.05
Atomic weight	u	167	.26	Melting point	K	1795
Bonding radius	A	1	.57	Boiling point	K	3136
Atomic radius	A	2	.45	Heat of vaporization	kJ/mol	261
Ionization Potential	V	6	.101	Heat of fusion	kJ/mol	19	.9
Electronegativity	-	1	.24	Specific heat	J/gK	0	.17
The oxide is weak base.				Crystal are hexagonal.
Electron configuration: [Xe] 4f¹² 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