The group of elements in which the last electron is present the anti-penultimate shell of atom called

The group of elements in which the differentiating electron enters the anti-penultimate shell of atoms are called

Number of electrons present in the penultimate shell of magnesium atom.

" The elements in which the differentiating electron enters into anti penultimate shell or "(n-2)" subshell are called "

The elements in which the differentiating electron enters into anti penultimate shell or "(n-2)f" subshell are called "

The elements in which the last electron enters into the p-orbitals of their outer-most shell are called p-blocks elements:- Name two allotrops of sulphur.

The elements in which the last electron enters into the p-orbitals of their outer-most shell are called p-blocks elements:- Give a method for the preparation of phosphine.

The number of electrons present in the valence shell of group 13: