The path a specific element will take depends on where the electrons are in the atom and how many there are. In the study of chemical reactivity, we will find that the electrons in the outermost principal energy level are very important and so they are given a special name. Valence electrons are the electrons in the highest occupied principal energy level of an atom. Lithium has a single electron in the second principal energy level and so we say that lithium has one valence electron.
Beryllium has two valence electrons. How many valence electrons does boron have? Explanation: Understanding valence electrons is key to understanding chemical bonding. Valence electrons are the electrons which are transferred when ionic bonds are formed. Here is a video reviewing how you can figure out how many valence electrons an atom has.
Noel P. Related questions How do valence electrons affect chemical bonding? The two hydrogen atoms and the oxygen share the electrons, which, in turn, form a water molecule. Water is one of many interesting examples of how valence electrons are at work in our world today. Take a look around you.
Our earth is simply filled with endless beautifully complex creations, much to the thanks of the work of valence electrons. Page content. What Functions Do They Perform? Why Are They Important? Go to Topic. Explanations 5. Jae Yoon Kim. Related Lessons. View All Related Lessons. Caroline Monahan. Valence Electrons. What are Valence Electrons? Valence electrons are located in the outermost shell of an atom Not every atom has the same number of valence electrons, it depends on the location of the element on the periodic table.
Image source: Caroline Monahan. How do Valence Electrons Form Bonds?
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