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a unit of mass that describes the mass of an atom or molecule.

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a region around the nucleus of an atom where electrons are most likely to be found.

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an atom that has the same number of protons as other atoms of the same element do but that has a different number of neutrons.

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a subatomic particle that has a positive charge and that is found in the nucleus of an atom.

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in physical science an atoms central region which is made up of protons and neutrons.

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the number of protons in the nucleus of an atom the atomic number is the same for all atoms of an element.

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The mass number is the sum of the protons and neutrons in an atom.

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The atomic mass of an element is the weighted average of the masses of all the naturally occurring isotopes of that element

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Neutrons are the particles of the nucleus that have no electric charge.

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The negatively charged particles that thomson discovered are now called electrons.

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An atom is the smallest particle into which an element can be divided and still be the same substance.