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1P1 Page # __ Date: Subatomic Particles The atom is composed of 3 neutrons , electrons and . The following table summarizes their properties. subatomic particle Standard subatomic particles, protons mass (a.u.) charge notation is a simplified way of identifying symbol, atomic number and atomic mass neutrons and electrons in an atom can be found location atoms. It includes the atom’s . The number of protons, with standard notation 12 C 6 # of protons = # of neutrons = # of electrons = 19 F 9 # of protons = # of neutrons = # of electrons = # p+ = atomic number # n0 = atomic mass - atomic number # e- = # p+ . Page # __ standard notation element name An atom is neutral # protons (+) # electrons (-) because the number of electrons equals of protons. Chemical reactions cannot and become negatively 9p+ 10no the number change the number of protons atom, but they can change the number of electrons 19 F 9 # neutrons (o) . Some atoms gain in an electrons charged ions. 19 F 9 9p+ 10no gains one electron Other atoms lose 7 Li 3 electrons to become positively charged ions. 7 + Li 3 3p+ 4no 3p+ 4no loses one electron Homework Read pg. 210 Do Q #1-3 pg. 217 Complete Subatomic Particle Worksheet