Question

What is the total number of pairs of electrons having at least 3 same quantum number of $Be$ ?

Answer 1

According to the question, first we have to know the configuration and then know the principle, azimuthal quantum number of each electron of the hybridization of Be.

Note: Beryllium is an alkaline earth metal and so may be expected to form ionic bonds. Since beryllium only has two valence electrons, it does not typically attain an octet through sharing of electrons.