Which particle is outside the nucleus and primarily involved in chemical reactions?

Which particle is outside the nucleus and primarily involved in chemical reactions?

• A. Proton
• B. Neutron
• C. Deuteron
• D. Electron

Answer: (D)

Chemical reactions involve electrons in the outer shells, not particles inside the nucleus. Electrons are the negatively charged pieces that can be shared or transferred between atoms to form bonds, so they rearrange to create new substances. Protons and neutrons stay inside the nucleus and mainly determine the identity and mass of an atom; they aren’t involved in bonding during ordinary chemical reactions. A deuteron is a nucleus made of a proton and neutron, also inside the nucleus, so it doesn’t participate in chemical bonding. Therefore, the particle outside the nucleus and primarily involved in chemical reactions is the electron.

Chemical reactions involve electrons in the outer shells, not particles inside the nucleus. Electrons are the negatively charged pieces that can be shared or transferred between atoms to form bonds, so they rearrange to create new substances. Protons and neutrons stay inside the nucleus and mainly determine the identity and mass of an atom; they aren’t involved in bonding during ordinary chemical reactions. A deuteron is a nucleus made of a proton and neutron, also inside the nucleus, so it doesn’t participate in chemical bonding. Therefore, the particle outside the nucleus and primarily involved in chemical reactions is the electron.