Answer:
C. in the outermost electron shell.
Step-by-step explanation:
Electrons are the smallest part of an atom.
Part of the Atom
There are 3 subatomic particles that make up the atom. These 3 particles are protons, neutrons, and electrons. Each particle has its own charge. Protons are positively charged. Neutrons have no charge (neutral). Electrons have a negative charge. Additionally, the proton and neutron are located within the nucleus. The electrons are in electron shells that orbit the nucleus.
Since the proton shell doesn't exist, we know B is incorrect.
Valence Electrons
Most elements have multiple electron shells, also known as energy levels. The electrons on the outermost shell are the valence electrons. These are the electrons that are involved in bonding and the creation of ions. Remember that ions are atoms that have had electrons added or removed.