Atomic number, mass number and isotopes 3.5 / 5 based on 3 ratings ? ChemistryAtomic number, mass number and isotopesGCSEAQA Created by: emewsCreated on: 31-10-17 17:18 What makes an atom? Neutron, proton, and electron 1 of 5 What is an isotope? An isotope is an atom with a different number of neutrons. 2 of 5 How many groups are there on the periodic table? There are 8 groups in the periodic table 3 of 5 How many elements are on the periodic table? 100 4 of 5 e e 5 of 5
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