Electrons location.

• A. Outside the nucleus in orbitals, determining chemical properties
• B. Inside the nucleus
• C. Made of quarks
• D. Have no charge

Answer: (A)

Electrons sit outside the nucleus in regions called orbitals (the electron cloud). Their arrangement, especially the electrons in the outermost shell, determines how an atom will bond with others and what its chemical properties will be. Electrons carry a negative charge and have very little mass compared with the nucleus, so their location and energy levels govern reactivity rather than the mass of the nucleus. They are not inside the nucleus, and they are not made of quarks (quarks are components of protons and neutrons, not electrons).