Sugar is a simple covalent bond and it is a monosaccharide, which is the simplest form of a carbohydrate. It is one of the most common covalent bonds on Earth.
Covalent bonds occur when electrons are shared by one or more atoms. These bonds happen in many different ways and ionic bonds are the only bonds that are not covalent. Covalent bonds are most common in elements that are not metal, but can occur when metal and nonmetal elements are physically situated within a short distance of each other. These types of bonds are different from a covalent sugar bond because sugar is made up of two nonmetal elements. Covalent bonds are only able to occur when elements that are close together on the periodic table of elements form together and begin sharing electrons.
While sugars are one of the finest examples of covalent bonds, they can often change depending on the elements that are around them. When atoms switch, the sugar is able to change from glucose to sucrose and back again. They can also be easily converted into more complex sugars with the addition of different substances, such as water, which turns sugar into a liquid form. Most sugars are derived from a type of glucose, but can be derived from any type of element that is a monosaccharide bond.