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For more info visit http://jeemains2018.in Chemical bond:Chemical bond is the attractive force which holds various constituents together in a molecule. There are three types of chemical bonds: Ionic Bond, Covalent Bond, Coordinate Bond. Octet Rule: Atoms form chemical bonds in order to complete their octet i.e. eight electrons in their valence shell. Lewis Structures: Pair of bonded electrons is by means of a ‘dash’ (-) usually called a ‘bond’. Lone pairs or ‘non-bonded’ electrons are represented by ‘dots’. Ele