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This small particle of an atom, carries a positive charge.

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Atomic mass-atomic #= Neutrons in the atom
Example: Lawrencium
Atomic #103
Atomic Mass- 260
260-103= 157 Neutrons

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This small particle of an atom carries a negative charge.

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Is normally the number of protons and electrons

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The atomic mass is equivalent  to the # of protons and neutrons in the atom.

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Mass is normally made up of Protons and Neutrons