The Periodic Table of Elements
89
Ac
Actinium
[ 227 ] amu
Additional Information:
| State | Group Block | Density | Atomic Radius | Electron Affinity | Ionization Energy | Melting Point | Boiling Point | Year Discovered |
|---|---|---|---|---|---|---|---|---|
| solid | actinoid | 10.07 kg/L | pm | 499 kJ/mol | 1323 °K | 3473 °K | 1899 |
