Thorium
Atomic number
90
Atomic weight
232.0381
Discovery (year)
1829
Atomic radius (A)
1.8
Melting point (
o
C)
1800
Boiling point (
o
C)
3000
Density (g/cm
3
)
11.7
Specific heat (cal/g
o
C)
0.028
Ionization potential (eV)
6.95
Electron Affinity (eV)
@
