An atom has electronic configuration $2$, $8$, $7$.
a) What is the atomic number of this element?

Q. An element has its electron configuration as $2,8,2$. Now answer the following questions: With which of the following elements would this element resemble? Atomic numbers are given in the brackets below: $N\left(7\right)$, $Be\left(4\right)$, $Ar\left(18\right)$, $Cl\left(17\right)$