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  • Which one of the following arrangements shows the correct order of  value of the given atomic species?<

Which one of the following arrangements shows the correct order of \Delta _{eg}H^- value of the given atomic species?

Option: 1

He>Ne>Ar>Kr


Option: 2

Ne<He<Ar<Kr


Option: 3

Ne>Ar>Kr>He


Option: 4

He<Ne<Ar<Kr


Answers (1)

best_answer

As we learnt

 

Electron gain enthalpy of noble gas in a group -

 

Down the group, the size of the atom increases and hence electron gain enthalpy have lower positive values.

- wherein

Electron gain enthalpy of   Ar(+96)   is lower than that of  Ne(+116)

 

 Ne has higher  \Delta _{eg}H^- value than He. As we move down the group atomic size increases also effective nuclear charge increases making it more easier to accept an electron. Hence the correct order is,

Ne>Ar>Kr>He

 

Posted by

Ritika Kankaria

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