Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In chemistry, a parent hydride is an unbranched acyclic or cyclic structure to which only hydrogen atoms are attached. Parent hydrides are the basic structures used in substitutive nomenclature.The bonding number of a skeletal atom in a parent hydride is the sum of the total number of valence bonds to adjacent skeletal atoms, if any, and the number of attached hydrogen atoms. In SH6, for example, S has bonding number 6. In substitutive nomenclature, a parent hydride is a compound with an unsubstituted skeleton of one or more elements from groups 13–17 of the periodic table, thus with only hydrogens attached to it. All elements have 'standard bonding numbers', that is for nitrogen and phosphorus 3, for carbon and silicon 4, et cetera.

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