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The first ionisation energy of magnesium...

The first ionisation energy of magnesium is greater
than that of sodium, whereas the recerse is true for
second ionisation energy. Explain.

Text Solution

Verified by Experts

(i) electronic configuration of sodium and magnesium
(ii) comparison of atomic size of sodium and
magnesium
(iii) effect of atomic size on first ionization energy
(iv) electronic configuration of stable ions of
sodium and magnesium
(v) relation between the stability of ion and the
respective ionization energy
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Knowledge Check

  • The first ionisation energy is maximum for

    A
    `Na`
    B
    `Mg`
    C
    `K`
    D
    `Kr`

  • The first ionisation energy of first atom is greater than that of second atom, whereas reverse order is true for their second ionisation energy. Which set of elements is not in accordance to above statement ?

    A
    C, B
    B
    P, S
    C
    B, Be
    D
    Mg, Na

  • The first ionisation energy of first atom is greater than that of second atom, whereas reverse order is true for their second ionisation energy. Which set of elements is in accordance to above statement?

    A
    `CgtB`
    B
    `PgtS`
    C
    `BegtB`
    D
    `MggtNa`

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