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Question:

Which of the following does not represent the correct order of the properties indicated?

N3−>O2−<F−<Na+(Nuclear charge)

LiK>Cs(IE)1

O2−>Ne>Mg2+>Al3+(Size)

Li>Be>B>C(Electron gain enthalpy)

Solution:

In any group zero group elements i.e inert gases have greatest size as their van der Waal's radius is measured instead of covalent, so O2−>Ne>Mg2+>Al3+ size order is incorrect.