Atomic Structure

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 charge Mass number Atomic number

Chart Element/ Ion Atomic Number Atomic Mass Mass Number ProtonsNeutronsElectrons N (15-7) 4 (7-3)

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