pulls objects toward one another

negatively charged particle

the sum of the protons and neutrons in an atom

particle of the nucleus with no electrical charge

a charged atom that forms when the numbers of electrons and protons are not equal

subatomic particle that has a positive charge

enables the neutron to change into a proton and an electron in certain unstable atoms

keeps the nucleus with two or more protons from flying apart

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

represents the sum of protons in the nucleus of an atom

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