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In the methane molecule, CH_4, each hydrogen atom is at a corner of a regular tetrahedron with the carbon atom at the center.
In the methane molecule, CH_4, each hydrogen atom is at a corner of a regular tetrahedron with the carbon atom at the center. In coordinates where one of the {rm C} {bf- } {rm H} bonds is in the direction of hat{ i } + hat{ j } + hat{k}, an adjacent {rm C} {bf- } {rm H} bond is in the hat{ i } - hat{ j } - hat{k} direction