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Published byJulie Hardy
Modified over 5 years ago
Atomic Number Found on the periodic table
Atomic Mass Found on the periodic table Round to the 10ths place
Mass Number If given, rewrite If not given, round the atomic mass to the nearest whole number
Protons Atomic number on the periodic table
Neutrons Mass # - atomic # = # neutrons
Electrons Electrons have a negative charge More e- than p + = negative charge Less e- than p + = positive charge No charge = # p + Negative charge = # p + + charge Positive charge = # p + - charge
Example N 15 7 +3 charge Mass number Atomic number
Chart Element/ Ion Atomic Number Atomic Mass Mass Number ProtonsNeutronsElectrons N714.01578 (15-7) 4 (7-3) 15 7 +3
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