Thulium Tm
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 28
Electron 29
Electron 30
Electron 31
Electron 1
Electron 2
Electron 3
Electron 4
Electron 5
Electron 6
Electron 7
Electron 8
Electron 1
Electron 2
Thulium is a chemical element with symbol Tm and atomic number 69. It is the thirteenth and antepenultimate (third-last) element in the lanthanide series. Like the other lanthanides, the most common oxidation state is +3, seen in its oxide, halides and other compounds.
69
Atomic Number
168.93 u
Atomic Mass
1818.15 K
Melting Point
2223 K
Boiling Point
9.32 g/cm³
Density
2.4 Å
Atomic Radius
1.9 Å
Covalent Radius
1.25
Electronegativity
6.18 eV
First Ionization Energy
99
Electron Affinity
6
Number of Shells
2, 8, 18, 31, 8, 2
Electron Shell Occupations
0.16 J/g
Specific Heat