Atomic Properties
- Atomic Number
- 99
- Atomic Mass
- 252.0000 u
- Electron Configuration
- [Rn] 5f11 7s2
- Electronegativity
- 1.30
- Block
- f-block
- Group
- —
- Period
- 7
Physical Properties
- Phase (STP)
- solid
- Melting Point
- 1133.00 K
- Boiling Point
- 1269.00 K
- Density
- 8.8400 g/cm³
About Einsteinium
Named after Albert Einstein; discovered in hydrogen bomb debris.
Isotopes of Einsteinium
Einsteinium has 0 naturally occurring isotopes, plus 1 notable radioactive isotope.
| Isotope | Mass Number | Atomic Mass (u) | Abundance | Type |
|---|---|---|---|---|
| 252Es | 252 | 252.08298 | — | Radioactive |
Data source: NIH PubChem (aggregated from IUPAC, NIST)