Electronic configuration
[Rn] 5f11 7s2
Einsteinium is one of the last elements where the 5f subshell is being filled.
At a glance
Inside the element
Oxidation states
+3 · most common
Es(III) compounds are the best characterized, with a chemistry similar to its actinide neighbors.
Radioactivity
t½ = 276 days
Es-252 is the longest-lived isotope and decays primarily through alpha emission.
Natural abundance
None
It does not occur naturally. Es is made by bombarding heavier actinides in a reactor.
Isotopes
View all isotopes →A short-lived family
| Isotope | Half-life | Decay mode | Abundance |
|---|---|---|---|
| Es-252 | 471.7 days | α Alpha | — |
| Es-253 | 20.47 days | β Beta / alpha | — |
| Es-254 | 275.7 days | α Alpha | — |