paucity (n.) late 14c., from Old French paucitÃ© (14c.) and directly from Latin paucitatem (nominative paucitas) fewness, scarcity, a small number, from paucus few, little, from PIE *pau-ko-, suffixed form of root *pau-(1) few, little (source also of few (adj.)).
All three molecules have four pairs of electrons around their central atom. As a result, they all have a tetrahedral arrangment of electron pairs around the central atom. The bond angle in methane, CH4, is the tetrahedral angle, i.e. 109.5 (109 28'). Ammonia, NH3, contains a lone pair of electrons, which repels the bonding electrons to give a bond angle of 107. The atoms have a trigonal pyramidal arrangement.
The SP2 predicted geometry is trigonal planar and what do you know, formaldehyde is trigonal planar. (ii) HCâ¡N. the bonding between the carbon and the nitrogen in hydrogen cyanide or hydrocyanic acid is a triple bond, hence the hybrid orbital is sp, due to the linear geometry of the molecule. (iii) Ch3CH2CH3.In Propane, the carbon atoms use sp3 hybrid orbitals for the formation of sigma bonds. The single covalent bonds joining carbon to carbon and carbon to hydrogen in alkanes are sigma bonds formed by the end-on overlap of electron orbitals, so that each carbon atom is the center of a tetrahedron.iii) Ch3CH2CH3. In Propane, the carbon atoms use sp3 hybrid orbitals for the formation of sigma bonds. The single covalent bonds joining carbon to carbon and carbon to hydrogen in alkanes are sigma bonds formed by the end-on overlap of electron orbitals, so that each carbon atom is the center of a tetrahedron.