When fluorine reacts with hydrogen, a covalent bond is formed between the two elements. How does this reaction occur and what is a covalent bond?...

Fluorine ( ) reacts with hydrogen ( ) to form the compound hydrogen fluoride ( ) as shown in the reaction below:

The bonds formed between H atoms and F atoms are covalent bonds. The electrons in a covalent bond are shared between the atoms. Covalent bonds can be composed of two shared electrons, four shared electrons, or six shared electrons. A covalent bond that is composed of two shared electrons is called a single bond. A covalent bond that is composed of four shared electrons is called a double bond. A covalent bond that is composed of six shared electrons is called a triple bond. The covalent bonds formed between H and F atoms are examples of single bonds.