Question

give the answer fastly

Answer 1

all have na+, mg 2+, f- has the same electronic configuration as that of Ne....as 1s2 2s2 2p6 but Cl- has electronic Configuration of Ar that is 1s2,2s2,2p6,3s2,3p6...all have their octet Complete

Answer 2

11Na+ =2,8
12Mg2+ =2,8
9F- =2,7
17CL- =2,8,8
Hope it helps you....