Why do atoms form bonds?

Why do atoms form bonds?

• A. To increase their mass
• B. To become ions
• C. To satisfy the octet rule
• D. To change their identity

Answer: (C)

Atoms form bonds to become more stable by completing their outer electron shells, which lowers the system’s energy. For most main-group elements, stability comes from having eight electrons in the valence shell, the octet rule. When atoms share electrons in covalent bonds or transfer electrons in ionic bonds, they can reach that full outer shell, achieving a noble-gas-like configuration and a lower energy state overall. This is why bonding occurs. Note that bonding doesn’t increase mass, nor does it require becoming ions—many bonds create neutral molecules. And bonding doesn’t change the identity of an atom’s nucleus. An example is water: oxygen shares electrons with hydrogen so oxygen effectively has eight electrons in its valence region, while hydrogen achieves its two-electron duet.

Atoms form bonds to become more stable by completing their outer electron shells, which lowers the system’s energy. For most main-group elements, stability comes from having eight electrons in the valence shell, the octet rule. When atoms share electrons in covalent bonds or transfer electrons in ionic bonds, they can reach that full outer shell, achieving a noble-gas-like configuration and a lower energy state overall. This is why bonding occurs.

Note that bonding doesn’t increase mass, nor does it require becoming ions—many bonds create neutral molecules. And bonding doesn’t change the identity of an atom’s nucleus. An example is water: oxygen shares electrons with hydrogen so oxygen effectively has eight electrons in its valence region, while hydrogen achieves its two-electron duet.