Which of the following configurations represents the most electronegative element?

Which of the following configurations represents the most electronegative element?

A
$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}$
B
$1 s^{2} 2 s^{2} 2 p^{5}$
C
$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{5}$
D
$1 s^{2} 2 s^{2} 2 p^{4}$

Solution:

$Z = 9$ is the atomic number of fluorine which is the most electronegative element.

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