The electronic configuration of two elements X and Y are given below:
X = `1s^2 2s^2 2p^6 3s^2 3p^6 4s^2` Y= `1s^2 2s^2 2p^6 3s^2 3p^5` The formula of the ionic compound can be formed between these elements is

The electronic configuration of elements are given below. A = 1s^2 , 2s^2 , 2p^6 , 3s^2 , 3p^6 , 4s^2 B = 1s^2 , 2s^2 , 2p^6 , 3s^2 , 3p^5 The formula of ionic compound that could be formed between two elements is

The electronic configuration of the elements A and B are 1s^(2),2s^(2),2p^(6),3s^(2)and1s^(2),2s^(2),2p^(5) respectively . The formula of the ionic compound that can be formed between these elements is

The electronic configuration of metal 'M' is 1s^2 2s^2 2p^6 3s^2 3p^6 4s ^1 and non- metal X is 1s^2 2s^2 2p^6 3s^2 3p^5 . The formula of ionic compound formed between these two elements is