Note that this does not apply to hydrogen H, which can only accommodate a duo (2 e – ). Add electrons as lone nonbonding pairs around peripheral atoms so they have octets (eight electrons total).Inevitably, there will be cases where it is possible to draw more than one skeletal structure.ĭraw bonds as lines between atoms. Another good way to choose is to choose the least electronegative atom. Given a formula, the central atom is typically the first atom (eg ClF 4 ), although this convention is not always followed (eg HNO 3 ). Hydrogen (H) and fluorine (F) each have a valence of 1, and generally these will not be central atoms (bonded to more than one atom). Choose a central atom (we will take as examples small molecules for which there is only one central atom, and the other atoms, the peripheral atoms, are all attached to the central atom). Which will help us decide how the atoms will bond.
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