12Mg = 2,8,2
\(\therefore\) Lewis symbol = 
11Na = 2,8,1
\(\therefore\) Lewis symbol = 
5B = 2,3
\(\therefore\) Lewis symbol = 
8O = 2,6
\(\therefore\) Lewis symbol = 
7N = 2, 5
\(\therefore\) Lewis symbol = 
35Br = 2,8, 18, 7
\(\therefore\) Lewis symbol = 
