Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions: Ca2+,V5+,Cl-,S2-

sodium (na), for example, has one electron in its valence shell. this is an unstable state because that valence shell needs eight electrons to be full. in order to fill its valence shell, find a way to add seven electrons to its valence shell

it's c (engineer's do their work with mechanical stuff not on any living being)