Einsteinium
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| General Properties | ||||||||
|---|---|---|---|---|---|---|---|---|
| Atomic number | Predicted atomic mass | Half-life of longest living isotope | Electron Configuration | First developed | ||||
| 99 | 252amu | Around 470 days | [Rn] 5f11 7s2 | 1952 | ||||
| General Properties | |
|---|---|
| Atomic number | 99 |
| Atomic mass | 252amu |
| Half-life of longest living isotope | Around 470 days |
| Electron Configuration | [Rn] 5f11 7s2 |
| First discovered | 1952 |
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Description and uses
Einsteinium is the 99th element of the periodic table. It was discovered in 1952 after a sample of nuclear fallout material was analysed, and found to contain a
few hundred atoms of a new element. The isotope with the longest half-life is 252Es, with a half life of around 470 days.