Question

Why lithium and beryllium are not predominantly ionic?

Answer 1

Lithium belongs to the family of Alkali metals whereas Beryllium belongs to the family of Alkali Earth Metals. In order to form ionic bonds an atom must lose electron easily to become positively charged ion or Cation. ... The lesser the ionization enthalpy the easier it is to form a cation and thus ionic bond.

Answer 2

Answer:sure , that li and be are not predominantly ionic

Explanation:because if you see the charge / atomic radii ratio of li is high and is different from its alkali group, you can also term it as ionisation energy is high in that group similarly be is also having high IE as compare to other members of alkaline earth metal group . Also you can compare this with FAJAN'S rule