JEE Main 202124 FebruaryMorning Shift

Exam: JEE Main
Year: 2021
Date: 24 February
Shift: Morning Shift
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

JEE Main 2021 · 24 February · Morning Shift · Chemistry · Classification of Elements and Periodicity in Properties

Consider the elements Mg, Al, S, P and Si, the correct increasing...

Consider the elements

Mg,

Al, S, P

and

Si,

the correct increasing order of their first ionisation enthalpy is:

Options

A $Al < Mg < Si < S < P$
B $Al < Mg < S < Si < P$
C $Mg < Al < Si < P < S$
D $Mg < Al < Si < S < P$

Correct answer

A. $Al < Mg < Si < S < P$

Step-by-step solution

In general from left to right in a period, ionisation enthalpy increases due to effective nuclear charge increases. but due to extra stability of half filled and full filled electronic configuration, required ionisation enthalpy is more from neighbouring elements.
i.e. first ionisation enthalpy order is

$Al < Mg < Si < S < P$

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