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

Atomic Structure

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