Interpretation:
The element that has an electronic configuration 1s22s22p63s23p5 needs to be determined.
Concept introduction:
The valence electronic configurations of p-block elements can be written as ns2np1−6, here n refers to the elements period and its principal energy level.

Answer to Problem 19STP
E. Chlorine has an electronic configuration of 1s22s22p63s23p5.
Explanation of Solution
Reason for correct option:
E. Elements of group 13 to 18 are p-block elements. In p-block elements number of valance electrons is equal to 10 subtracted from their respective group number. In a neutral
Reason for incorrect option:
Electronic configuration of sodium is [Ne]3s1
Electronic configuration of chromium is [Ar]3d54s1
Electronic configuration of argon is [Ne]3s23p6
Electronic configuration of chlorine is [Ne]3s23p5
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