[" The electronic configuration of three elements,"A" ."B" and "C" are given below."],[" Answer the questions "05" to "09" on the basis of these configurations."],[[" A "1s^(2),2s^(2),2p^(5)],[" B "1s^(2),2s^(2),2p^(5),3s^(2),3p^(3)],[," C "," is "^(2),2s^(2),2p^(6),3s^(2),3p^(5)],[," b."B_(2)C]]