65Tb158.925

Terbium

Lanthanide

Terbium is a chemical element with symbol Tb and atomic number 65. It is a silvery-white rare earth metal that is malleable, ductile and soft enough to be cut with a knife. Terbium is never found in nature as a free element, but it is contained in many minerals, including cerite, gadolinite, monazite, xenotime and euxenite.

Phase: SolidAppearance: silvery white

2, 8, 18, 27, 8, 2

Physical Properties

Atomic Mass158.925352 u

Density8.23 g/cm³

Melting Point1629 K

Boiling Point3396 K

Molar Heat28.91 J/(mol·K)

Period6

PhaseSolid

Chemical Properties

Electron Configuration1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f9

Semantic Config[Xe] 4f9 6s2

Shells2, 8, 18, 27, 8, 2

Electron Affinity112.4 kJ/mol

Electronegativity1.1

Ionization Energies

IE1: 565.8 kJ/molIE2: 1110 kJ/molIE3: 2114 kJ/molIE4: 3839 kJ/mol

Discovery

Discovered byCarl Gustaf Mosander

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