Basic Chemistry 0.0 / 5 ? ChemistryWriting balanced equationsGCSEAQA Created by: Emma;) xxxxCreated on: 30-04-13 22:57 Nucleus Protons (+1) & Neutrons (0) 1 of 5 Molecules in an atom Electrons (-1): First Shell- Maximum 2 electrons. All other shells- Maximum 8 electrons 2 of 5 Reactivity If the last shell on an atom is full the element is not going to be reactive because it doesnt want to gain or lose any electrons. 3 of 5 Mass Number The mass number is the amount of protons and neutrons e.g. 13 protons, 27 mass number= 14 neutrons 4 of 5 Atomic Number The atomic number is the amount of protons and electrons in the element 5 of 5
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