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Einsteinium (Es)
Atomic number: 99 · Category: actinide · Group 3 · Period 7 · Phase: Solid
Einsteinium is a synthetic element with symbol Es and atomic number 99. It is the seventh transuranic element, and an actinide. Einsteinium was discovered as a component of the debris of the first hydrogen bomb explosion in 1952, and named after Albert Einstein.
Atomic mass: 252
Density: 8.84
Melting point: 1133 K
Boiling point: 1269 K
Appearance: silver-colored
Source: Wikipedia
Block: f
CPK color:#b31fd4
Electronic structure
Electron configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f11
Configuration (semantic): [Rn] 5f11 7s2
Shells: 2, 8, 18, 32, 29, 8, 2
Electronegativity (Pauling): 1.3
Electron affinity: -28.6
Ionization energies: 619
Periodic position
Group: 3
Period: 7
xpos: 13
ypos: 10
Spectral/Bohr images
Image
3D Model