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Mg^(+2) is smaller than O^(-2) in size, ...

`Mg^(+2)` is smaller than `O^(-2)` in size, though both have same electronic configuration - explain.

Text Solution

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`Mg^(2+) and O^(-2)` are isoelectronic but `Mg^(2+)` has more number of protons (12) than `O^(-2)(8). Due to more attractive power of nucleus of `Mg^(2+)` it is smaller than `O^(2-)`.
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Knowledge Check

  • The molecular electronic configuration of B_2 is

    A
    `K K ( sigma 2s)^2 ( sigma^(**) 2s)^2 ( pi 2p)_(x)^(1) ( pi p)_(y)^(1)`
    B
    `K K ( sigma 2s)^2 ( sigma^(**) 2s)^2 ( pi 2p)_(x)^(2) `
    C
    `K K ( sigma 2s)^2 ( sigma^(**) 2s)^2 ( pi 2p)^2`
    D
    `K K ( sigma 2s)^2 ( sigma^(**) 2s)^2 ( pi 2p)^(1) ( pi p)^(1)`

  • The following pair of ions have the same electronic configuration

    A
    `Cr^(3+) and Fe^(3+)`
    B
    `Fe^(3+) and Mn^(2+)`
    C
    `Fe^(3+) and Co^(3+)`
    D
    `Sc^(3+) and Cr^(3+)`

  • The molecule electronic configuration of B_(2) is

    A
    `KK(sigma2s)^(2)(sigma**2s)^(2)(pi2p)_(x)^(1)(pi2p)_(y)^(1)`
    B
    `KK(sigma2s)^(2)(sigma^(**)2s)^(2)(pi2p_(x)^(2))`
    C
    `KK(sigma2s)^(2)(sigma**2s)^(2)(pi2p)^(2)`
    D
    `KK(sigma2s)^(2)(sigma**2s)^(2)(sigma2p)^(1)(pi2p)^(1)`

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