Stable isotope Gadolinium (Gd)

Isotope Z(p) N(n) Atomic Mass Natural Abundance Enrichment Level Chemical Form
Gd-152 64 88 151.919789 0.20% 30.60-34.80% Oxide
Gd-154 64 90 153.920862 2.18% 52.10-64.20% Oxide
Gd-155 64 91 154.922619 14.80% >90.00% Oxide
Gd-156 64 92 155.922120 20.47% ≥93.30% Oxide
Gd-157 64 93 156.923957 15.65% 88.40% Oxide
Gd-158 64 94 157.924101 24.84% >97.30% Oxide
Gd-160 64 96 159.927051 21.86% 98.20% Oxide

Properties of Gadolinium

Name Gadolinium
Symbol Gd
Atomic number 64
Atomic weight 157.25
Standard state Solid at 298 ºK
CAS Registry ID 7440-54-2
Group in periodic table N/A
Group name Lanthanoid
Period in periodic table 6 (Lanthanoid)
Block in periodic table f-block
Color Silvery white
Classification Metallic
Melting point 1313 °C
Boiling point 3266 °C
Vaporization point 3266 ºC
Thermal conductivity 10.5 W/(m·K) at 298.2 ºK
Electrical resistivity 134.0 µΩ·cm at 25 ºC
Electronegativity 1.1
Specific heat 0.230 J/g mol at 20 ºC
Heat of vaporization 305 kJ·mol-1 at 3266 ºC
Heat of fusion 10 kJ·mol-1
Density of liquid 7.4 g/cm3 at 1313 °C
Density of solid 7.90 g/cm3
Electron configuration [Xe]4f75d16s2 (partially filled f orbital)
Common oxidation state +3