simple covalent molecules	A covalent bond is a pair of electrons (usually one from each atom) shared between two nuclei. In a correct structure, counting shared electrons with both atoms, H always winds up with 2 outer electrons and every other atom with 8. Both atoms in the bond must come from groups 4-7, including H.
examples	H2 CH3CH2CH2OH CF4
practice	simple covalent: CH4, H2O, NH3, CH3CH3, CH3CH2Cl, CH3CH(NH2)CH2OH, CH2OH(CHOH)CH2OH, (CH2)4assorted: B, H2O, MgF2, Se-2, CH3CHOHCH2F, NF3, Mg3N2

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