Elements / 99
99Es[252]
Einsteinium
Actinide · f-block · ring Q
Einsteinium is element 99, an actinide. It is one of the actinides, which the spiral keeps in line on ring Q instead of exiling them to a strip below the table.
Properties
| Density | 8.84 g/cm³ | Terrain → |
|---|---|---|
| Melting point | 1,133 K · 860 °C | Terrain → |
| Boiling point | 1,269 K · 996 °C | Terrain → |
| Electronegativity | 1.30 | Terrain → |
| First ionization energy | 619 kJ/mol | Terrain → |
| Atomic weight | 252 u | Terrain → |
| Crustal abundance | Not measured | Terrain → |
| Discovered | 1952 | Terrain → |
Values from open reference data; see sources. "Terrain" opens that property as a 3D landscape across the whole spiral.
Two things you might not know
- Its radioactivity is so strong it rapidly destroys its own crystal lattice, and the energy released makes it glow.
- Named after a physicist called Albert. First found in debris of the 1952 hydrogen bomb test at Enewetak Atoll.
Checked against en.wikipedia.org.
Actinides
- Ac Actinium
- Th Thorium
- Pa Protactinium
- U Uranium
- Np Neptunium
- Pu Plutonium
- Am Americium
- Cm Curium
- Bk Berkelium
- Cf Californium
- Es Einsteinium
- Fm Fermium
- Md Mendelevium
- No Nobelium
Ring Q (period 7)
Play with Einsteinium
Watch it fly into its seat, or raise the whole spiral into a landscape and see where it peaks.