A. An element with the valence electron configuration 5s1 would form a monatomic ion with a charge of In order to form this ion, the element will electron(s) from/into the subshell(s). B. An element with the valence electron configuration 2s22p4 would form a monatomic ion with a charge of In order to form this ion, the element will electron(s) from/into the subshell(s)