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5) the element name is magnesium (z=12)
6)the electronic configuration of chlorine is (z=17)
1s2 2s2 2p6 3s2 3p5
7) the valency is sodium is 1
valency electrons are 1
6)the electronic configuration of chlorine is (z=17)
1s2 2s2 2p6 3s2 3p5
7) the valency is sodium is 1
valency electrons are 1
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