Positively charged particle inside the nucleus - Protons, The smallest building unit of matter that share in chemical reaction - Atom, Negatively charged particle revolving in energy levels - Electrons , The sum of protons and neutrons  - Mass number , The total number of protons in an atom - Atomic number, Particles that carry no charge - Neutrons , Calculate the mass number of helium - 4, Calculate the atomic number of oxygen  - 8, Calculate the neutrons no. In potassium atom  - 20, The imaginary regions (places) around the nucleus in which the electrons move according to their energies. - Energy levels,

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