Question

What is the difference between the electron configuration of Na and Na+?

Answer 1

The electron configuration of `"Na"^+"` has one less electron, and is isoelectronic with the noble gas neon.

Explanation:

The electron configuration of `"1s"^2"2s"^2"2p"^6"3s"^1"`, or `"[Ne]3s"^1"`.

The electron configuration of `"1s"^2"2s"^2"2p"^6"`, in which the `"3s"^1"` electron has been lost, and which is the electron configuration of the noble gas neon.