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Arrange the species in each group in order of increasing ionization energy and give reason: (a) K+, Cl-, Ar, (b) Na, Mg, Al, (c) C, N.

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(a) Cl- < Ar < < K+ became nuclear change goes on increasing, 

(b) Na < Al < Mg because Mg has stable electronic configuration and Na has large atomic size due to which it has lowest ionization energy, 

(c) C < O < N because N has half filled p-orbital which is more stable whereas carbon is larger in size.

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