The formation of chemical bonds is based on the tendency of an atom to
A. Moveprotons into vacant electron orbit spaces
B. Fill its outermost energy level
C. Radiate excess neutrons
D. Pick up free protons
The correct answer and explanation is:
The correct answer is B. Fill its outermost energy level.
Explanation:
The formation of chemical bonds arises from the tendency of atoms to achieve a stable electron configuration. This often involves filling the outermost electron shell, also called the valence shell. Atoms are most stable when their outer shell is full, which typically corresponds to the electron configuration of a noble gas.
Atoms that have an incomplete valence shell are more likely to form bonds with other atoms in order to fill this shell. There are two main types of chemical bonds that atoms can form: covalent bonds and ionic bonds.
- Covalent bonds occur when two atoms share electrons in such a way that each atom feels like it has a full valence shell. For example, in a molecule of water (H₂O), the hydrogen atoms each share an electron with the oxygen atom, and the oxygen atom shares electrons with the hydrogen atoms. This creates a stable electron arrangement for all atoms involved.
- Ionic bonds occur when one atom donates one or more electrons to another atom, resulting in the formation of positive and negative ions. These ions are then held together by electrostatic forces. For instance, in sodium chloride (NaCl), sodium (Na) donates an electron to chlorine (Cl), creating Na⁺ and Cl⁻ ions that are attracted to each other.
Both bond types are ultimately driven by the goal of filling the outermost energy level, achieving stability by following the octet rule (for most atoms), where an atom aims to have eight electrons in its valence shell.
Therefore, the primary reason atoms form bonds is to fill their outermost energy level, which leads to greater stability.