69
168.934 u
Tm
Thulium
Lanthanide
Atomic Structure
Physical State
Group
N/A
Period
6
Block
f
Electron Configuration
[Xe] 4f¹³ 6s²
Physical Properties
Atomic Mass:
168.934 u
Electronegativity:
1.25
Atomic Radius:
222 pm
Ionization Energy:
6.184 eV
Density:
9.321 g/cm³
Melting Point:
1818 K
Boiling Point:
2223 K
Historical Information
Discovered By:
Per Teodor Cleve
Year Discovered:
1879