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  4. Among the following, the element of highest first ionisation enthalpy is

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Q. Among the following, the element of highest first ionisation enthalpy is

KEAMKEAM 2012Classification of Elements and Periodicity in Properties

Solution:

The electronic configuration of the given elements is as

${ }_{6} C =1 s^{2}, 2 s^{2}, 2 p^{2} $

${ }_{9} F =1 s^{2}, 2 s^{2}, 2 p^{5}$

${ }_{4} Be =1 s^{2} 2 s^{2} $

$7 N =1 s^{2}, 2 s^{2} 2 p^{3} $

$10 Ne =1 s^{2}, 2 s^{2}, 2 p^{6}$

Thus, Ne has the highest ionisation enthalpy because of its completely filled configuration and high effective nuclear charge.