question_answer 6)

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

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