Answer:
Mg
At. No. 12 2, 8, 2
\[\underset{{}}{\mathop{\overset{\,\,}{\mathop{_{\bullet
}^{{}}Mg\,_{\bullet }^{{}}}}\,}}\,\]
valency
= 2
Na
At. No. 11 2, 8, 1
\[\underset{{}}{\mathop{\overset{\,\,}{\mathop{_{{}}^{{}}Na\,_{\bullet
}^{{}}}}\,}}\,\]
valency
= 1
B
At. No. 5 2, 3
\[\underset{{}}{\mathop{\overset{\bullet
\,\,}{\mathop{_{\bullet }^{{}}Na\,_{\bullet }^{{}}}}\,}}\,\]
valency
= 3
0
At. No. 8 2, 6
\[\overset{\bullet
\,\,\bullet }{\mathop{_{\bullet }^{\bullet }O\,_{\bullet }^{\bullet }}}\,\]
valency
= 8 - 6 = 2
Br
At. No. 35 2, 8, 18, 7
\[\underset{\bullet
\,\,\bullet }{\mathop{\overset{\bullet \,\,\bullet }{\mathop{_{\bullet
}^{\bullet }Br\,_{\bullet }^{{}}}}\,}}\,\]
valency
= 8 - 7 = 1
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