Glossary of Terms Unit C1 Part 1 0.0 / 5 ? ChemistryAtomsGCSECCEA Created by: acleary638Created on: 13-03-19 16:45 Atomic number The number of protons in the nucleus of an atom 1 of 8 Mass number The number of protons and neutrons in the nucleus of an atom 2 of 8 Isotopes Atoms of an element which have the same number of protons but have a different number of neutrons 3 of 8 Cation Positive ion 4 of 8 Anion Negative ion 5 of 8 Element Substance that consists of only one type of atom and cannot be broken down into simpler substances by chemical means 6 of 8 Atom Simplest particle of an element that can exist on its own in a stable enviroment 7 of 8 Molecule A particle that consists of two or more atoms chemically bonded together 8 of 8
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