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  • Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species.  <st

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species.

 

Option: 1

\quad C l<F<S<O


Option: 2

\quad O<S<F<C l


Option: 3

\quad S<O<C l<F


Option: 4

\quad F<C l<O<S


Answers (1)

best_answer

As we have learnt, 

Electron gain enthalpy generally becomes more negative on moving from left to right along a period and becomes less negative on moving from top to bottom down a group.

However, the period 3 elements have a more negative value of electron gain enthalpy than their period 2 counterparts because of smaller size of 2p orbitals which cause inter electronic repulsions.

Thus, the correct order of electron gain enthalpy (with negative sign) is

O<S<F<Cl

Posted by

Rakesh

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