The correct answer is C. Electrons orbit around the nucleus.
The three subatomic particles in an atom are:
Protons are positively charged particles found in the dense center of the atom called the nucleus. The number of protons in an atom gives it its unique identity. All hydrogen atoms only have 1 proton, helium atoms have 2. If the number of protons changes, then the name or kind of atom also changes. But this only happens when atoms are subjected to nuclear reactions.
Neutrons are uncharged particles also found in the nucleus of the atom.
Together, the protons and neutrons contribute to the mass of the atom indicated by its mass number.
Electrons are negatively charged subatomic particles that are found outside the nucleus. The regions where there is a high probability of finding an electron are called orbitals.
Electrons are responsible for the different chemical properties and reactivity of atoms. They are very tiny and light particles so their masses are negligible. Unlike protons, the number of electrons in an atom may change. An atom may lose or gain electrons in the presence of other atoms. When this happens, the identity of the atom remains the same but it becomes a charged particle or an ion. Atoms that lose electrons become positively charged and are called cations. Atoms that gain extra electrons become negatively charged and are called anions.
