Question

1. a covalent bond forms when a. protons are shared between atoms. c. the partial end of one molecule b. an electron is transferred from one atom to another. d. two atoms share a pair of electrons

Explanation:

A covalent bond is formed by the sharing of electron - pairs between atoms. Protons are not involved in covalent bond formation. Electron transfer forms an ionic bond. The partial end of one molecule is related to intermolecular forces, not covalent bond formation.

Answer:

D. two atoms share a pair of electrons