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Question -

Write Lewis symbols forthe following atoms and ions:

S and S2–; Al and Al3+;H and H–



Answer -

(i) S and S2–

The number of valenceelectrons in sulphur is 6.

TheLewis dot symbol of sulphur (S) is 
The dinegative charge infers that there will betwo electrons more in addition to the six valence electrons. Hence, the Lewisdot symbol of S2– is 

(ii) Al and Al3+

The number of valenceelectrons in aluminium is 3.

TheLewis dot symbol of aluminium (Al) is
The tripositive charge on a species infers thatit has donated its three electrons. Hence, the Lewis dot symbol is .

(iii) H and H–

The number of valenceelectrons in hydrogen is 1.

TheLewis dot symbol of hydrogen (H) is .
The uninegative charge infers that there will beone electron more in addition to the one valence electron. Hence, the Lewis dotsymbol is .

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