Chemistry 2A - Atoms and Compounds 0.0 / 5 ? ChemistryAtoms and compoundsGCSEAQA Created by: Maddie A-PCreated on: 20-03-15 20:42 What do the mass number and atomic number mean? Mass Number: Total number of protons and neutrons Atomic Number: Total number of protons (same as number of electrons) 1 of 5 What are the relative masses of protons, neutrons and electrons? Proton: 1 Neutron: 1 Electron: very small 2 of 5 What is a compound? It is when atoms of two or more elements are chemically combined together. It is difficult to separate the two original elements out again. 3 of 5 List the main properties of ionic compounds. They have a regular lattice structure. They all have similar properties. 4 of 5 Explain what is meant by the term isotope. Isotopes are: different atomic forms of the same element, which have the same number of protons but a different number of neutrons. 5 of 5
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