Jiangsu Education Compulsory 2 Unit 1 "External Nuclear Arrangement and Periodic Law" ppt (1) Mass number (A) = number of protons (Z) + number of neutrons (N) atomic number = number of nuclear charges = number of protons ( Z) = number of electrons (3) cation: extranuclear electron number = proton number-charged number (4) anion: extranuclear electron number = proton number + charged number
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