Periodic Table
99
Es
252
Einsteinium
ActinoidSynthetic; discovered in H-bomb debris.
Electronic Configuration
[Rn] 5f¹¹ 7s²or1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 5f¹¹ 7s²
Electron shells
2e⁻n=1
8e⁻n=2
18e⁻n=3
32e⁻n=4
29e⁻n=5
8e⁻n=6
2e⁻n=7
Properties
Atomic number
99
Atomic mass
252 u
Category
Actinoid
Block / Group / Period
f · — · 7
Valence electrons
2
Oxidation states
+3
Electronegativity
1.3
Atomic radius
186 pm
Ionization energy
619 kJ/mol
Electron affinity
-29 kJ/mol
Melting point
1133 K / 860 °C
Boiling point
1269 K / 996 °C
Density
8.84 g/cm³
State at 25 °C
solid
Personal Notes
Add personal notes for Einsteinium here...