A sodium metal has electron configuration 2,8,1 , what is the electron configuration of sodium ion?

Na⁺ = 1s² 2s² 2p⁶ 3s⁰

Explanation:

Sodium is alkali metal.

It is present in group 1.

Its atomic number is 11.

Its atomic mass is 23 amu.

Its electronic configuration is,

Na₁₁ = 1s² 2s² 2p⁶ 3s¹

Thus electrons in 3 energy levels are 2, 8, 1.

Sodium have one valance electron. The one valance electron of sodium is easily lost by sodium atom and get stable electronic configuration and form cation.

Na  → Na⁺ + 1e⁻

Electronic configuration of sodium ion:

Na⁺ = 1s² 2s² 2p⁶ 3s⁰

Thus electrons in 3 energy levels are 2, 8.

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