Two Beryllium atoms are able to bond with one Carbon atom. Each Beryllium gives up both of its two extra electrons to the Carbon. Take a look and see how all of the electrons are shared. 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.
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