Which phrase best describes a covalent bond?
gaining protons
losing electrons
sharing of protons
sharing of electrons

The correct answer is sharing of electrons.

Explanation:

Covalent bond is defined as the bond which is formed when sharing of electrons takes place between the atoms. This is usually formed between two non-metals.

For Example: Formation of hydrogen chloride molecule

Electronic configuration of hydrogen =

Electronic configuration of chlorine =

Hydrogen and chlorine atoms are need only 1 electron to attain stable electronic configuration. So, they share electron and form covalent bond.

Hence, the correct answer is sharing of electrons.

that's what i got you can count the number of atoms