Write the complete electron configuration for the common monatomic ion formed by the element rubidium, rb

To write the electron configuration, you begin with the normal electron configuration of the element and then add or deduct the number of electrons that the charge designates. Rubidium will change from
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^1
to
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 because it loses the last electron.

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