Periodic table of the elements
ErbiumThuliumYtterbium
69
Tm
Thulium
168.93421
2
8
18
31
8
2
69
Tm
Thulium
168.93421
2
8
18
31
8
2
General
NameThulium
SymbolTm
Number69
Chemical seriesLanthanides
Group / Period0 / 6
Blockf-block
CAS registry number7440-30-4

Physical properties
Statesolid
Density9.32 g/cm3
Melting point1818 K (1545 °C, 2813 °F)
Boiling point2223 K (1950 °C, 3542 °F)
Critical point

Atomic properties
Atomic Weight168.93421 g/mol
Crystal structurehexagonal
Electronegativity1.25
Atomic radius175 pm
Atomic radius (calculated)222 pm
Electron configuration[Xe] 4f13 6s2
Electrons per shell2, 8, 18, 31, 8, 2
Number of protons69
Number of neutrons100

Other languages
SpanishTulio
PortugueseTúlio
FrenchThulium
GermanThulium
ItalianTulio
RussianТулий
PolishTul
Chinese
Arabicثوليوم
TurkishTulyum
DutchThulium


Periodic table of the elements
ErbiumThuliumYtterbium