What is the correct increasing order of electron affinity for the given elements?

[1 mark]

N < O < Cl < Al

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Al< O < N < Cl

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Al < N < O < Cl

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N < O < Al < Cl

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Solution

The correct option is C Al < N < O < Cl
As we move from left to right in a period, the atomic size decreases and the nuclear charge increases. So, the electron affinity increases.
On moving from the top to the bottom in a group, the atomic size increases more than the nuclear charge, hence the electron affinity decreases.
Therefore, the correct order is: Al < N < O < Cl.

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