Published by:
CGP EDU Academic Team
Published on: August 12, 2026
For the third period elements the correct decreasing order of first ionisation enthalpy is
A
B
S 
P 
Si 
C
S 
P 
Si 
D
Text Solution
Verified by ExpertsThe correct answer is:
A
On moving, move from left to right in a period ionisation energy increases. ' P ' and ' Mg ' has
comparatively due to their half-filled and fully-filled electronic configuration which is more stable valence subshell than 'S' and 'Al'. Thus, the correct decreasing order of first ionisation enthalpy is 
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