Electrons. These orbit the nucleus. They have a negative charge and a tiny mass of 1/2000.., Neutrons. These are found in the nucleus, they have no charge and a mass of 1., Protons. Also found in the nucleus, they have a +1 charge and a mass of 1., The nucleus is the centre of the atom, where the neutrons and protons are located., These are electron energy shells where the electrons orbit around the nucleus..

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