Which subatomic particles primarily affect the stability of an atom?

• A. Electrons
• B. Quarks
• C. Neutrons
• D. Protons

Answer: (C)

Verified step by step guidance

1. Understand that an atom consists of three main subatomic particles: protons, neutrons, and electrons.
2. Recall that protons determine the identity of the element because they define the atomic number.
3. Recognize that electrons primarily influence chemical behavior and bonding, but have little effect on nuclear stability.
4. Focus on neutrons, which reside in the nucleus along with protons and help stabilize the nucleus by offsetting the repulsive forces between positively charged protons.
5. Conclude that the number of neutrons affects the stability of the atom's nucleus, making neutrons the primary subatomic particles responsible for atomic stability.