The correct trend in the first ionization enthalpies of the elements in the 
period of periodic table is :
Text Solution
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First ionization enthalpy generally increases across a period due to increasing nuclear charge and decreasing atomic radius. However, exceptions occur based on electron configuration stability.
For 3rd period elements, the approximate ionization enthalpy values are: 
(1251) 
.
(1) Al has lower IE than Si because removing 
is easier than removing one electron from 
.
(2) S has slightly lower IE than P despite being to the right because P has a half-filled p -orbital ( 
) which is more stable.
(3) Cl has the highest IE as it approaches a filled p-orbital.
The correct order is: 
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