Question

The first, second, third and fourth ionization energy values of an element are $191,578,872,$ and $5692$ kcals. The number of valence electrons in the element are:

• A. $5$
• B. $2$
• C. $3$
• D. $4$

Answer 1

The correct option is C $3$

There is a large difference between the third and fourth ionization energy of the given element. Thus, the given element should have three valence electrons as after losing three electrons it will attain a very stable full-filled configuration.

Hence, the correct option is $\text{C}$