Actinium

Actinide

Symbol: Ac

Atomic Number: 89

Standard State: Solid

Atomic Mass: 227.0278

Electron Configuration: [Rn]7s2 6d1

Electronegativity: 1.1

Atomic Radius: 260

Ionization Energy: 5.17

Melting Point: 1324

Boiling Point: 3471

Density: 10.07

Year Discovered: 1899