Atomic Element Z = 65 • Lanthanide
Terbium (Tb) — Atomic Data, Electron Shells & Reactions
Terbium (symbol Tb, atomic number 65) has a standard atomic weight of 158.93 u and ground-state configuration [Xe] 4f9 6s2.
Atomic Number (Z)
65
IUPAC Symbol
Tb
Standard Atomic Weight
158.93 g/mol
Period / Group / Block
6 / f-block / f-block
Condensed Electron Config
[Xe] 4f9 6s2
Full Subshell Config
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f9 5s2 5p6 6s2
Principal Shell Occupancy
[2, 8, 18, 27, 8, 2]
Pauling Electronegativity
1.1
First Ionization Energy
566 kJ/mol
Covalent Radius
194 pm
Melting Point
1629 K (1355.85 °C)
Boiling Point
3503 K (3229.85 °C)
Density
8.229 g/cm³
Oxidation States
+3
Tb (Z=65) — Valence shell highlighted in vermilion