Protactinium |
Symbol | Pa |
---|---|
Latin name | Protaktinium |
Atomic number | 91 |
Period | 7 |
Element category | Inner transition elements |
Relative atomic mass | 231.0359 |
Group | V.B |
Electronegativity | 1.5 |
Oxidation numbers | 4, 5 |
Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6 5f2 6d1 7s2 |
Density [g/cm3] | 15.37 |
State | Solid |
Melting point [°C] | 1550 |
Boiling point [°C] | 4225 |
Thermal conductivity [W m-1K-1] | 47 |
Discovery | 1917 |
1.st ionization energy [eV] | 5.89 |
Stable isotopes | 0 |
Unstable isotopes | 13 |