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.
To see how the existence of lone pairs affects the molecular shape and the VSEPR model of crystal molecules, work out the basic shape of the crystal molecule first and then apply the lone pairs. [XeF 5 ] - : Xenon is in group 8 so it has 8 electrons in its valence shell.or [XeF 5 ] â the basic shape is pentagonal bipyramidal with the lone pairs opposite each other to minimise the repulsions of the lone pair/lone pair repulsions. Therefore the [XeF 5 ] â molecule is a pentagonal planar shape without the lone pairs.