Ionization energy is always positive for an element and successive ionization energies always gradually increase.
The successive ionization energy for an element is given below in mJ/mole.
0.7865, 1.5771,3.2316, 4.3555, 16.091, 19.785, 23.786, 29252
Predict the number of valence shell electrons in the given element. 

Options

A. 1
B. 2
C. 3
D. 4

Answer

D