subatomic particles, particles smaller than and inside the atom, proton, positively charged particle inside the nucleus, neutron, particle inside the nucleus without a charge, electron , negatively charged particle located on the orbits around the nucleus, nucleus, makes up 98% of the mass of the atom, positively charged, atomic number, tells you the number of protons in an element's atom, atomic mass, this number is the total protons and neutrons.

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