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  • The CORRECT order of first ionisation enthalpy is :Option: 1 Mg < S < Al < POption: 2 Mg < Al < S < POption: 3 Al < Mg < S < POption: 4 Mg < Al < P < S

The CORRECT order of first ionisation enthalpy is :
Option: 1 Mg < S < Al < P
Option: 2 Mg < Al < S < P
Option: 3 Al < Mg < S < P
Option: 4 Mg < Al < P < S

Answers (1)

best_answer

As we have learnt,

Ionisation energy increases along a period on moving from left to right. However, species having fully-filled or half-filled orbital configurations have greater ionisation energy than the element on their right.

So, Mg, Al, P and S can be arranged as

Al < Mg < S < P

Hence, the correct answer is option (3).

Posted by

sudhir.kumar

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