Covalent Bond Definition

Steps:

• Recall that covalent bonds form between non-metal atoms sharing electrons to achieve stability.
• Evaluate option A: Matches the sharing of electron pairs between non-metals.
• Check B: Describes ionic bonding via electron loss, not sharing.
• Check C: Sharing occurs between atoms, not ions; ions form ionic bonds.
• Check D: Refers to ionic attraction, not electron sharing.

Why A is correct:

• Covalent bonds involve two non-metal atoms sharing a pair of valence electrons to fill their outer shells, as defined in Lewis dot structures.

Why the others are wrong:

• B: This describes ionic bonds where metals lose electrons to non-metals.
• C: Positively charged ions do not share electrons; they transfer them in ionic bonds.
• D: This explains electrostatic attraction in ionic bonds, not covalent sharing.

Final answer: A