1. (i) What is the common feature of the electronic configurations of the elements at the end of period 2 and period 3?   2. (ii) If an element is in group 7 (or group 7A), is it likely to be metallic or non-metallic in character?   3. (iii) Supply the missing word from those in brackets: If an element has one electron in its outermost energy level (shell) then it is likely to be ............... (metallic/non−metallic).