CHM136H1 Chapter Notes - Chapter 2: Hexane, Benzene, Electrical Resistivity And Conductivity
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CHM136H1 Full Course Notes
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Ionic bonding ion: a charged particle (formed from atoms by loss/gain of one or more electrons) Group 1,2,3 > lose electrons to form cations (+) Group 5,6,7 > gain electrons to form anions (-) Transition elements can form more than 1 type of ions e. g. fe > fe2+/ fe3+ (forming compounds with different colours polyatomic ions: ions that are made up of more than 1 atom. Ionic compounds form when oppositely charged ions attract. Ionization: where electrons are transferred between atoms charged ions (ionic compound) held together by electrostatic forces (ionic bond) no net loss or gain of electrons/ compound is electrically neutral. 1. 8 units + > compound that is predominantly ionic. Covalent bonding electron sharing between 2 non-metals electrostatic attraction- covalent bond groups of atoms held together by covalent bonds = molecule. Octet rule- tendency of atoms to form a stable arrangement of 8 electrons in their outer shell double bond - sharing of 4 electrons.