Periodic Table of the Elements: Actinium
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| Atomic Number: | 89 |
| Atomic Symbol: | Ac |
| Actiniumactinium [Gr.,=like a ray], radioactive chemical element; symbol Ac; at. no. 89; mass number of most stable isotope 227; m.p. about 1,050°C;; b.p. 3,200°C;±300°C;; sp. gr. 10.07; valence +3. Actinium is a silver-white metal with a cubic crystalline structure. ..... Click the link for more information. | |
| Atomic Weight: | (227) |
| Electron Configuration: | 2 · 8 · 18 32 · 18 9 · 2 |