This type of clothing should not be worn for parties, weddings and other formal or ceremonial events. They should not also be worn for work. Various items of clothing such as tee-shirts, denims, khakis, jackets, hoodies, mini-skirts, summer dresses, loafers, sneakers, and sandals are casual wear.
The presence of a lone pair decreases the bond angle between the bonding pair of electrons, due to their high electric charge which causes great repulsion between the electrons. They are also used in the formation of a dative bond.
These geometries have ideal bond angles of 109.5â in three dimensions, but the lone pair 'crunches' the atoms together a little, so the angles become less than 109.5â. This molecule is similar to NH3 with one hydrogen replaced with Câ¡N.