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thorium
Atomic number:
90
Atomic weight:
232.0381
Symbol:
Th
Group number:
(actinide)
Electronic configuration:
[Rn].6d2.7s2
Physical data
Standard state:
solid at 298 K
Colour:
silvery white
Density of solid at ambient temperature/kg m-3:
11724
Molar volume/cm3:
19.8
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