Structure and bonding 0.0 / 5 ? ScienceAtomsGCSEAQA Created by: Holly45Created on: 02-03-15 17:32 Covalent bonding share electrons examples include: methane CH4 and Ammonia NH3 1 of 4 Ions and formulas atoms that have lost or gained electrons are ions any positive ions can be combined with any negative ions to form ionic compounds the overall charge of any compound is zero 2 of 4 Atoms, compounds and isotopes mass number: total number of protons and neutrons atomic number: number of protons compounds are formed when atoms of elements are bonded together isotopes have the same number of protons but a different number of neutrons 3 of 4 Ionic bonding loose or gain electrons ionic compounds always have giant lattices there is a strong electrostatic force of attraction between opposite ions when ionic compounds melt, the ions are free to move and they can carry an electric current 4 of 4
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