Due to it's electronic configuration w/c is 1s2 2s2 2ps 3s1 considering the last w/c is 3s1, sodium should be in row 3 period a1.
The Correct answer to this question is translation
Magnesium + oxygen = magnesium oxide
hope that helps
<span>Co3+ is Cobalt with three electrons removed (It's positive by 3). So, the abbreviated notation for Cobalt, minus three electrons (Coming from 4s and 3d) is:
[Ar]4s1, 3d5</span>
