Why do atoms combine to form chemical bonds?

• A. To increase their atomic number
• B. To achieve a more stable electron configuration
• C. To become radioactive
• D. To decrease their mass number

Answer: (B)

Verified step by step guidance

1. Understand that atoms combine to form chemical bonds primarily to achieve greater stability.
2. Recall that atoms are most stable when they have a full outer electron shell, often referred to as the octet rule for many elements.
3. Recognize that by sharing, donating, or accepting electrons through chemical bonds, atoms can complete their valence electron shells.
4. Note that increasing atomic number or decreasing mass number are nuclear changes, not related to chemical bonding.
5. Conclude that the driving force behind bond formation is to reach a more stable electron configuration, which lowers the overall energy of the system.