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65 - Terbium lanthanide

Discovered by Carl Gustaf Mosander in 1843

Terbium

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.
Shell Electrons Orbitals
1 2 2 in 1s
2 8 2 in 2s + 6 in 2p
3 18 2 in 3s + 6 in 3p + 10 in 3d
4 27 2 in 4s + 6 in 4p + 10 in 4d + 9 in 4f
5 8 2 in 5s + 6 in 5p
6 2 2 in 6s
TerbiumTb Electron 1 Electron 2 Electron 1 Electron 2 Electron 3 Electron 4 Electron 5 Electron 6 Electron 7 Electron 8 Electron 1 Electron 2 Electron 3 Electron 4 Electron 5 Electron 6 Electron 7 Electron 8 Electron 9 Electron 10 Electron 11 Electron 12 Electron 13 Electron 14 Electron 15 Electron 16 Electron 17 Electron 18 Electron 1 Electron 2 Electron 3 Electron 4 Electron 5 Electron 6 Electron 7 Electron 8 Electron 9 Electron 10 Electron 11 Electron 12 Electron 13 Electron 14 Electron 15 Electron 16 Electron 17 Electron 18 Electron 19 Electron 20 Electron 21 Electron 22 Electron 23 Electron 24 Electron 25 Electron 26 Electron 27 Electron 1 Electron 2 Electron 3 Electron 4 Electron 5 Electron 6 Electron 7 Electron 8 Electron 1 Electron 2
158.93  u Atomic Mass
2.5  Å Atomic Radius
3503  K Boiling Point
1.94  Å Covalent Radius
8.23  g/cm³ Density
112.4 Electron Affinity
1.2 Electronegativity
5.86  eV First Ionization Energy
1630.15  K Melting Point
6 Number of Shells
65 Atomic Number
2, 8, 18, 27, 8, 2 Electron Shell Occupations