No compounds of representative elements are found with ions having charges greater than the group number because

Options

A. these elements do not exhibit variable valency
B. once atoms of these elements have lost their valence electrons, they have stable noble gas or pseudo noble gas configurations
C. they are `s-` and p-block elements
D. they have good shielding electrons

Answer

B

Explanation

The `Delta_iH_2` of Na is nearly ten times greater as the electron in this case must be taken from `Na^(+)`, which has a neon configuration. Mg and Al atoms show similar behaviors as the energy needed to take an electron from either of the ions that result (`Mg^(2+)` and `Al^(3+)`) is extremely high.