posted by Dave .
ELement A has a valence electronic structure of ns2np1. Element B has the valence electronic structure of ns2np5.
Write a formula for the compound that would be formed from elements A and B.
Element A has three electrons to lose to make the last shell eight. Element B has 1 electron to gain to make a shell of 8. So the compound AxBy will have what for x and y?
Note: Element A MAY have a variable valence in which it could lose just 1 of those outside electrons so A COULD conceivably combine with B to form more than one compound. I think the spirit of the problem, however, is for A to lose three electrons.