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Matter 2
Subatomic Particles
Term | Definition |
---|---|
Proton | Positively charged subatomic particle with a mass of 1 a.m.u. |
Neutron | Particle with a mass of 1 a.m.u. and no charge that adds mass and helps hold nucleus together |
Electron | Negatively charged subatomic particle that is found outside of the nucleus |
Quarks | Fundamental particles from which Protons and Neutrons are made |
Atomic number | The number of protons in an atom |
Chemical reactivity | Determined by the number and arrangement of electrons |
Mass number | The number of protons and neutrons in an atom |