Hydrogen has one valence electron because it is an element found in group 1 of the periodic table. It is a simple task to find the number of valence electrons from the periodic table by looking at the group number found above each column. Similarly, the electrons found in an atom's outer shell are called valence electrons.
Henry Cavendish discovered the element hydrogen in 1766. Hydrogen is a gas, and its electron configuration is 1s^1. This element is made up of one electron and one proton. It has a melting point of -434.49 degrees Fahrenheit and a boiling point of -423.18 F. It can make compounds with many other elements. In the chemical industry, an application of hydrogen is in the manufacture of ammonia for fertilizers.