Question

which of the following is not a correct statement from the lewis theory of bonding?
a full valence shell of electrons may be achieved by the sharing of electrons between non - metal atoms.
electrons are most stable when they are unpaired.
atoms and ions are stable if they have a full valence shell of electrons.
the sharing of electrons results in a covalent bond.

Explanation:

Lewis Theory focuses on valence electrons and stability via full valence shells. Non-metals share electrons (covalent bonds) for full shells (A, D correct). Stability comes from full valence shells (C correct). Electrons are more stable paired (Hund’s rule allows unpaired in degenerate orbitals but full/paired shells are key for bonding stability), so "unpaired electrons are most stable" is incorrect.

Answer:

B. Electrons are most stable when they are unpaired.