All chemical elements

Symbol

Er

Atomic number

68

Chemical property

Lan­thanide

Origin o the name

Ytterby, Sweden

Period

6

Atomic weight (u)

167.259

Atomic weight uncertainty (u)

0.003

Density (g/cm³)

9.066

Melting point (K)

1802

Boiling point (K)

3141

Heat capacity (J/(g·K))

0.168

Electro-negativity

1.24

Abundance in earth's crust (mg/kg)

3.5