Question

When the compound Na2S forms what happens to the Na and S ions

Answer 1

nothing, ATOMS lose or gain electrons to become IONS 
Two Na ATOMS lose 1 electron each and 1 S ATOM gains 2 electrons 

Answer 2

Since sodium ions each have a single positive charge (lacking one electron in its valence orbital) and sulfur ions each have a 2- charge (having two extra electrons in its valence orbital), the compound Na2S forms when two sodium ions are ironically bound to a central sulfur.