Question

chapter: Structure of the atom.

1.Draw the structure of S,CL,Ar,Ca And Mg ( atomic numbers 16,17,18 ,6 and 12).

2.write the valencies of Sodium, Aluminum, Oxygen, Fluorine and Nitrogen.
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Answer 1

Valencies:

Sodium= +1

aluminum= +3

oxygen= -2

fluorine= -1

nitrogen= -3

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