If they share four it's a double bond. It's extremely strong and powerful. Because the bond between Carbon and Nitrogen is so strong, scientists call them Cyanogen instead of Carbon Nitrogen. Scientists know that Cyanogen is always CN . You should know that even though there are two electrons involved in a bond, those electrons are used in different ways.
Ionic bonds happen when electrons are given up by one atom to another.
Covalent bonds happen when electrons are shared by both atoms. Andrew Rader Studios, All rights reserved.