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.
In BF3, all 3 electron pairs around boron are bonding pairs. The molecular geometry is trigonal planar with bond angles of 120. In molecules with no lone pairs around the central atom, like BF3, the electron pair arrangement and molecular geometry will be the same.