Covalent bonds are bonds where electrons are shared between atoms to make a full outer shell of electrons on each atom. A good example of a covalent bond is H20 or water. Hydrogen has only 1 electron and as the electrons configuration goes 2,8,8,2, hydrogen needs an electron to fill its outer shell.
Oxygen has 16 electrons, meaning it needs two electrons to fill its outer shell. Therefore, each hydrogen atom shares one electron each and the oxygen atom shares 2 electrons. This makes each atom have a full outer shell.
Covalent bonds usually involve two non metal elements and will involve atoms that do not have a full outer shell.
A student in England studying Automotive Engineering with Motorsport, Will created Ask Will Online back in 2010 to help students revise and bloggers make money. You can follow AskWillOnline via @AskWillOnline.
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About Will Green
At first, I was using Ask Will Online to help myself revise for school exams. I then started to find areas in blogging that were tricky to overcome so I started making articles on generally blogging help. Now, Ask Will Online has differentiated into many sub categories so that even more people can now take use of my website.