Q.

Which of the following is/are true order(s)?

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a

O2<O<O+ Zeffective 

b

 Na<Al<Mg<Si Ionisation potential

c

B+<B<B Size

d

I<Br<Cl<F Electron affinity

answer is A, C, D.

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Detailed Solution

The order of atomic size for the boron ions can be given as,

B+<B<B

The order of effective nuclear charge for the oxygen ions can be given as,

O2<O<O+

As atomic size grows down the group, the effective nuclear charge over the valence electron lowers, making it easier to remove the electron and reducing the ionisation potential.

Na<Al<Mg<Si

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