The correct answer is C. Electron.
A nucleon is a subatomic particle that is found in the nucleus of an atom. Protons and neutrons are the two types
of nucleons. Electrons are not nucleons, they are found in the atom’s electron cloud.Protons have a positive charge, neutrons have no charge, and electrons have a negative charge. The number of protons in the nucleus determines the chemical element of the atom. For example, all atoms that have 1 proton in their nucleus are hydrogen atoms. The number of neutrons in the nucleus can vary, and atoms with the same number of protons but different numbers of neutrons are called isotopes.
Electrons are much lighter than protons and neutrons. They are also much smaller than protons and neutrons. The mass of an electron is about 1/1836 the mass of a proton. The diameter of an electron is about 100,000 times smaller than the diameter of a proton.
Electrons are found in the atom’s electron cloud. The electron cloud is a region around the nucleus where electrons are found. The electron cloud is not a solid object, it is a region of space where electrons are likely to be found.
The number of electrons in an atom is equal to the number of protons in the nucleus. This is because atoms are electrically neutral. The positive charge of the protons in the nucleus is balanced by the negative charge of the electrons in the electron cloud.
Electrons are important because they determine the chemical properties of atoms. The number of electrons in an atom’s outer shell determines how the atom will react with other atoms.