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  • I need help with In which of the following arrangements the order is NOT according to the property indicated against it?

In which of the following arrangements the order is NOT according to the property indicated against it?

  • Option 1)

    Al^{3+}<Mg^{2+}<Na^{+}<F^{-}- increasing ionic size

  • Option 2)

    B<C<N<O   - increasing first ionisation enthalpy

  • Option 3)

    I<Br<F<Cl    increasing electron gain enthalpy    (with negative sign)

  • Option 4)

    Li<Na<K<Rb  - increasing metallic radius

 

Answers (1)

best_answer

As we learnt in

Factors affecting I.E -

Removal of an electron from half filled and full filled atom require more energy than expected.

When we look into option 2, we find a discrepancy there that O is shown to have a greater I.E than N. Usually, I.E increases along a period but as N has half filled orbitals, removal of electrons requires more energy.


Option 1)

Al^{3+}<Mg^{2+}<Na^{+}<F^{-}- increasing ionic size

This option is incorrect.

Option 2)

B<C<N<O   - increasing first ionisation enthalpy

This option is correct.

Option 3)

I<Br<F<Cl    increasing electron gain enthalpy    (with negative sign)

This option is incorrect.

Option 4)

Li<Na<K<Rb  - increasing metallic radius

This option is incorrect.

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Aadil

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