Answer:
1. the Sodium electron configuration will be 1s^2 2s^2 2p^6 3s^1.
2. the Chlorine electron configuration will be 1s^2 2s^2 2p^6 3s^2 3p^5.
3. the Magnesium electron configuration will be 1s^2 2s^2 2p^6 3s^2.
4. the Iodine electron configuration will be 4d^10 5s^2 5p^5.
5. The Bromine elctron configuration will be 4s²3d¹⁰4p⁵.
