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the number of positive charges or protons in the nucleus of an atom of a given element

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the integer nearest in value to the atomic weight of an atom and equal to the number of nucleons in the nucleus of the atom.

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the mass of an isotope of an element measured in units formerly based on the mass of one hydrogen atom taken as a unit.

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Any of two or more forms of a chemical element.

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the group of electrons revolving around the nucleus of an atom.

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an elementary particle that is a fundamental constituent of matter, having a negative charge.

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The central and most important part of an object.

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Protons and neutrons, each with mass approximately one atomic mass unit.

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a unit of mass used to express atomic and molecular weights.

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They are neutrons with approximately one atomic mass unit.

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It is made up of tiny particles.