Engineering
Chemistry
Electronic Configuration
Question
Be and Mg have zero value of electron affinity, because :
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Solution
Be and Mg have [He] 2s2 and [Ne] 3s2 fully filled configuration respectively.
2s and 3s orbitals are filled to their capacity and they don't need any more electron to gain stability.
Be and Mg are unable to accept electron because they want to lose an electron to get the nearest nobel gas configuration.
Hence, option (D) is correct.