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Question 1 of 6
1 of 6
Match the term to its definition.
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Subatomic particles with a mass of 1 and a positive charge.
Total number of protons and neutrons in an atom.
Subatomic particles with a mass of 1 and no charge.
Atoms of an element with different numbers of neutrons.
Protons
Mass number
Neutrons
Isotopes
Two subatomic particles are in the nucleus and make up the mass of the atom. One of these cannot change in number as it defines the element, while the other one can.