The first four ionization enthalpies of an element are `578 kJ mol^(-1), 1817kJ mol^(-1), 2745kJ mol^(-1)`, and `11575 kJ mol^(-1)`. The element is

Options

A. `Na`
B. `Si`
C. `Mg`
D. `A1`

Answer

D

Explanation

The data indicate that the first three electrons are removed form the same shell, i.e., the element should have `3` valence shell electrons. Thus, the element is `A1 `with the configuration `1s^(2)2s^(2)2p^(6)3s^(2)3p^(1)`.