Question

why sodium forms +1 ions not +2 ions​

Answer 1

Answer:

Sodium has one valence electron. Sodium forms Na+ ion by losing its valence electron and attains the stable electronic configuration of Ne with a completed octet. This requires less energy. The removal of the second electron will break this stable electronic configuration and requires high energy.

hope it may help you.

Answer 2

Sodiums electronic configuration is 2,8,1.

So it loses 1 electron (Na - e- Na+) to become stable and hence forms +1 ions and not +2 ions