Atomic and mass number flash cards 5.0 / 5 based on 1 rating ? ChemistryAtomsGCSEAQA Created by: TylaMorganCreated on: 19-03-16 11:10 What are the atomic and mass numbers? Two numbers which tell you how many of each kind of particle an atom has 1 of 6 What does the Mass number tell you? The total number of protons and neutrons 2 of 6 What does the Atomic number tell you? The total number of protons 3 of 6 How do you work out the number of neutrons? Take away the atomic number from the mass number. E.g. for Sodium (Na) 23-11=12 4 of 6 Why are electrons not counted in the Mass number? Electrons are not counted in the mass number because their relative mass is very small 5 of 6 What is the relative mass of each particle? Proton: 1 Neutron:1 Electron: Very small 6 of 6
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