Identify the elements represented by the following electronic configurations:
$(a)$ $[He] \, 2s^1$
$(b)$ $[Ne] \, 3s^2 \, 3p^3$
$(c)$ $[Ar] \, 4s^2 \, 3d^1$

(N/A) The electronic configuration is $[He] \, 2s^1$. The atomic number $Z = 2 + 1 = 3$. Thus,the element is Lithium $(Li)$.
$(b)$ The electronic configuration is $[Ne] \, 3s^2 \, 3p^3$. The atomic number $Z = 10 + 2 + 3 = 15$. Thus,the element is Phosphorus $(P)$.
$(c)$ The electronic configuration is $[Ar] \, 4s^2 \, 3d^1$. The atomic number $Z = 18 + 2 + 1 = 21$. Thus,the element is Scandium $(Sc)$.