NO. 064Lanthanide

Gd

Gadolinium

Gadolinium is a lanthanide used in MRI contrast agents and neutron absorption applications.

Crystal Structure

Hexagonal close-packed (hcp)

Atomic Mass157.25 u

Density7.9 g/cm³

Melting Point1586 K

Boiling Point3546 K

Atomic Radius180 pm

Electronegativity1.2

Ionization Energy593 kJ/mol

Electron Affinity50 kJ/mol

Bonding TypeMetallic

Oxidation States3

Acid/BaseBasic

ReactivityHigh

Electron Configuration

[Xe] 4f7 5d1 6s2

Discovered ByJean Charles Galissard de Marignac

Year1880

Known Isotopes

Gd-152Gd-154Gd-155Gd-156Gd-157Gd-158Gd-160