1. Methane, CH4, contains a carbon atom bonded to four hydrogens.The four equivalent bonds of C to H which are four geometrically equivalent directions corresponds to a tetrahedral configuration. 2.The electron-dot structure of NH3 places one pair of nonbonding electrons in the valence shell of the nitrogen atom. The configuration is trigonal pyramidal.3.The central atom of water is O. The configuration which is composed of linear bonds is bent