Actinium
allotrope
Ac
A rare, intensely radioactive metal — one of the rarest elements on Earth
← Allotrope of Actinium
A crystalline allotrope of Actinium (space group F m -3 m), sourced from the Crystallography Open Database (COD 9008458).
Material
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Crystallography
| Catalogue identity | Actinium — F m -3 m - F m -3 m |
| Formula | Ac |
| Crystal system | cubic |
| Space group | F m -3 m |
| Lattice (a, b, c) Å | 5.311, 5.311, 5.311 |
| Angles (α, β, γ) ° | 90, 90, 90 |
| Density (g/cm³) | 10.065 |
| Determination | Experimental (measured) |
Structure data: Crystallography Open Database · Public domain (CC0)