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NEET-XI-Chemistry

04: Chemical Bonding and Molecular Structure

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  • #3
    Write Lewis symbols for the following atoms and ions:

    S and S2-; Al and Al3+; H and H-
    Ans : (i) S and S2-

    The number of valence electrons in sulphur is 6.

    The Lewis dot symbol of sulphur (S) is .

    The dinegative charge infers that there will be two electrons more in addition to the six valence electrons. Hence, the Lewis dot symbol of S2- is .

    (ii) Al and Al3+

    The number of valence electrons in aluminium is 3.

    The Lewis dot symbol of aluminium (Al) is.

    The tripositive charge on a species infers that it has donated its three electrons. Hence, the Lewis dot symbol is .

    (iii) H and H-

    The number of valence electrons in hydrogen is 1.

    The Lewis dot symbol of hydrogen (H) is .

    The uninegative charge infers that there will be one electron more in addition to the one valence electron. Hence, the Lewis dot symbol is .