• # question_answer 6) Write Lewis dot symbols for atoms of the following elements and predict their valencies. Mg, Na, B, O, Br

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