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Q.
Which atom $(X)$ is indicated by the following configuration?
$X \to [Ne] 3s^2\,3p^3$
Structure of Atom
Solution:
Given electronic configuration of $X :[ Ne ] 3 s ^{2} 3 p ^{3}$
where $[Ne]$ is $1 s^{2} 2 s^{2} 2 p^{6}$
thus $X$ is: $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{3}$
Its an element with atomic number $(2+2+6+2+3)=15$
It is Phosphorus $( P )= X$