State quantum number of charge. Also state the kinds of charges present in the body.
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A proton is a positively charged particle located in the nucleus of an atom. An electron has
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times the mass of a proton, but an equal and opposite negative charge.
An elementary charge — that of a proton or electron — is approximately equal to 1.6×10-19Coulombs.
Unlike protons, electrons can move from atom to atom. If an atom has an equal number of protons and electrons, its net charge is 0. If it gains an extra electron, it becomes negatively charged and is known as an anion. If it loses an electron, it becomes positively charged and is known as a cation.
Key Terms
nucleus: the massive, positively charged central part of an atom, made up of protons and neutrons
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