The atom is made up of three types of sub-atomic particles: protons, neutrons and electrons. The atom is neutral because it has the same amount of positive protons and negative electrons.
Protons: A proton has a positive relative charge of one. It is found in the nucleus with the neutron. The atomic number is the amount of protons in an atom. Sometimes they are equal to the amount of neutrons, but most of the time there are less protons than neutrons in an atom. The proton has a relative mass of 1
Neutrons: A neutron has no charge. It is found in the nucleus with the proton. The amount of neutrons is found by taking the atomic number from the mass number. The neutron number is always equal or higher than the proton number. In ions the number of neutrons is what defines the element, so we do not take it away. The neutron has a relative mass of 1.
Electrons: An electron has a negative relative charge of one. They are found in shells (orbitals) that orbit the nucleus. The amount of electrons is the same as the amount of protons, so it is the atomic number. If we take away or add electrons we can make ions. The electron has a relative mass of 1/1836, or 1/2000 simplified.
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