Find the atomic number of an element whose atom has the electronic configuration 2, 8, 4.

The electronic configuration of the atom of an element X is 2, 8, 4. In the modern periodic table, the element X is placed in :

$\left(a\right)2^{nd}group$ $\left(b\right)4^{th}group$ $\left(c\right){14}^{th}group$ $\left(d\right)8^{th}group$

An element 'Z' has the electronic configuration 2, 8. Name the element 'Z' and determine its atomic number.