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N^(3-),O^(2-),F^-,Na^+, Mg^(2+),Al^(3+) ...

`N^(3-),O^(2-),F^-,Na^+, Mg^(2+),Al^(3+)` what is comman in them ?

Text Solution

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They are isoelectronic (10 electrons).
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N^(3-),O^(2-),F^-,Na^+, Mg^(2+),Al^(3+) Arrange them in the order of increasing ionic radii.

Group of ions are given below: Na^+ , Al^(3+) , O^(2-) , Ca^(2+) , Mg^(2+) , F^- , N^(3-) , Br(-) Two of the above ions are not isoelectronic. Identify them.

Knowledge Check

  • The ions 'O^(2-), F^-, Na, Mg^(2+)' and 'Al^(3+)' are isoelectronic. Their radii show:

    A
    an increase from 'O^(2-)' and 'F^-' and then decreases from 'Na^+' to 'Al^(3+)'
    B
    a decrease from 'O^(2-)' to 'F^-' and then increase from 'Na^+' to 'Al^(3+)'
    C
    a significant increase from 'O^2' to 'Al^(3+)'
    D
    a significant decrease from 'O^(2-)' to 'Al^(3+)'

  • The ionic size of Na^+ , Mg^(2+) , Al^(3+) and Si^(4+) follows the order: Na^+ltMg^(2+)ltAl^(3+)ltSi^(4+) , Na^+gtMg^(2+)gtAl^(3+)gtSi^(4+) Na^+gtMg^(2+)ltAl^(3+)ltSi^(4+) , Na^+ltMg^(2+)gtAl^(3+)gtSi^(4+)

    A
    'Na^+ltMg^(2+)ltAl^(3+)ltSi^(4+)'
    B
    Na^+gtMg^(2+)gtAl^(3+)gtSi^(4+)'
    C
    Na^+gtMg^(2+)ltAl^(3+)ltSi^(4+)'
    D
    Na^+ltMg^(2+)gtAl^(3+)gtSi^4,+'

  • The ionic radii of isoelectronic species 'N^(3-), O^(2-)' and 'F^-' in 'A^0' are in the order

    A
    '1.36,1.40,1.71'
    B
    1.36,1.71,1.40'
    C
    1.71,1.40,1.36'
    D
    1.71,1.36, .1 .40'

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