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Structural formula
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=== Electrons === [[File:Ions.svg|thumb|298x298px|Charges on atoms and their formation]] [[Electrons]] are usually shown as colored-in circles. One circle indicates one electron. Two circles indicate a pair of electrons. Typically, a pair of electrons will also indicate a negative charge. By using the colored circles, the number of electrons in the valence shell of each respective atom is indicated, providing further descriptive information regarding the reactive capacity of that atom in the molecule.<ref name=":0" />
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