NH3 has 3 bonding pairs of electrons and 1 lone pair. Therefore its based on a tetrahedral shape... which have bond angles of 109.5 But due to the repulsion of the lone pairs you have to minus 2.5 as they have greater repulsion than bonded electrons So u get a bond angle of 107 degrees
NH3 has 3 bonding pairs of electrons and 1 lone pair. Therefore its based on a tetrahedral shape... which have bond angles of 109.5 But due to the repulsion of the lone pairs you have to minus 2.5 as they have greater repulsion than bonded electrons So u get a bond angle of 107 degrees
CH4 has a bond angle of 109.5 degrees. Take away one a hydrogen, and you get a lone pair. Reducing the bond angle by 2.5 degrees - making it 107 degrees.