What is the compatibility of atoms?
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The valence of an element is the number of unpaired electrons it has in its last energy level. An atom expresses an interest in giving up an unpaired electron in its last energy level or accepting another electron there to fill or pair an unpaired state. Sometimes, because the electronegativity of both elements is equal or close, they share electrons without exchanging electrons. In these cases, the number of electrons that are exchanged, given, or shared is the composition of the element.