The Periodic Table of Elements
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65
Tb
Terbium
Summary
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.
Block: f
Period: 6
Group: 3
Atomic Mass: 158.925 g/mol (amu)
Discovered By: Carl Gustaf Mosander
Phase: Solid
Boiling Point: 3396 K
Melting Point: 1629 K
Type: lanthanide
Density: 8.23 g/cm3
Electron Configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f9
Electron Configuration (Semantic): [Xe] 4f9 6s2