23. What is the charge of Nitrogen wh en it forms an ion? 3+ b. 3- d.5. 24. What is the charge of Strontium ion? 2+ b. 2- 25. What will happen to the valence electron of magnesium when it undergoes an ionic bond? Lose 4 d. Gain 2 b. Gain 4 c.6+ d.6- c.Lose