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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.  

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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