Which part of the atom is primarily responsible for allowing one atom to react with another atom?

• A. Inner (core) electrons
• B. Protons in the nucleus
• C. Neutrons in the nucleus
• D. Valence electrons

Answer: (D)

Verified step by step guidance

1. Understand that atoms react with each other primarily through interactions involving their electrons.
2. Recall that electrons in an atom are arranged in energy levels or shells, with the outermost shell called the valence shell.
3. Recognize that valence electrons are the electrons in the outermost shell and are the ones involved in forming chemical bonds.
4. Note that inner (core) electrons are closer to the nucleus and generally do not participate in chemical reactions because they are held tightly by the nucleus.
5. Conclude that valence electrons are primarily responsible for allowing one atom to react with another atom, as they can be shared, gained, or lost during chemical reactions.