Problem: Enter the full electron configuration for S2-. What is the atomic symbol for the noble gas that also has this electron configuration?

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Electron configuration for S2-

Sulfur (S)

  • atomic number = number of electrons = 16

S2-

  • gained 2 electrons 
  • number of electrons = 16 + 2 = 18

Aufbau Principle totally fill in the lowest energy orbital first
Hund’s Rule electron orbitals that are degenerate (same energy) are first half-filled before they are totally filled   


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Enter the full electron configuration for S2-. What is the atomic symbol for the noble gas that also has this electron configuration?

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