All chemical elements

Symbol

Pr

Atomic number

59

Chemical property

Lan­thanide

Origin o the name

the Greek praseios didymos meaning 'green twin'

Period

6

Atomic weight (u)

140.90766

Atomic weight uncertainty (u)

0.00002

Density (g/cm³)

6.773

Melting point (K)

1208

Boiling point (K)

3793

Heat capacity (J/(g·K))

0.193

Electro-negativity

1.13

Abundance in earth's crust (mg/kg)

9.2