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Atomic number 90Th

Thorium

থোরিয়াম

  • Actinide
  • Period 7
  • Atomic mass 232.040 u
  • Solid

90p142n
Electrons per shell
2, 8, 18, 32, 18, 10, 2
Electron configuration
[Rn] 6d2 7s2
Nucleus
90 protons, 142 neutrons
Speed1×
Group
None (f-block)
Period
7
Block
f-block
Category
Actinide
State at 25 °C
Solid