Element Actinium (Ac)

Atomic number 89 · actinide · Atomic mass 227 u

Atomic Mass
227.0000 u
Element Properties
Atomic Number 89
Atomic Mass 227.0000 u
Category actinide / 锕系元素
Group 3
Period 7
Block D
Electron Configuration [Rn] 6d¹ 7s²
Electronegativity (Pauling) 1.1
Phase at STP Solid
Density 10.07 g/cm³
Year Discovered 1899

Explore all 118 elements or calculate molar mass of any compound

Periodic Table → Molar Mass Calculator →
← Back to Periodic Table