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.
2) There are two types of valence shell electron pairs viz., i) Bond pairs and ii) Lone pairs. Bond pairs are shared by two atoms and are attracted by two nuclei. Hence they occupy less space and cause less repulsion. Lone pairs are not involved in bond formation and are in attraction with only one nucleus.