Since there is a negative charge on the outside of the Lewis dot structure, one electron needs to be added to the structure. For example, if the structure is an ion, the charge will be included outside of the Lewis dot structure. This helps when trying to solve oxidation questions.Ī charge number also can help when drawing Lewis dot structures. įor example, the charge on a chloride ion, C l − is +1. All particles of ordinary matter have integer-value charge numbers, with the exception of quarks, which cannot exist in isolation under ordinary circumstances (the strong force keeps them bound into hadrons of integer charge numbers).Ĭharge number or valence of an ion is the coefficient that, when multiplied by the elementary charge, gives the ion's charge. Atomic numbers ( Z) are a special case of charge numbers, referring to the charge number of an atomic nucleus, as opposed to the net charge of an atom or ion. Na + is a sodium ion with charge number positive one (an electric charge of one elementary charge). ![]() The charge numbers for ions (and also subatomic particles) are written in superscript, e.g. ( January 2014)Ĭharge number ( z) refers to a quantized value of electric charge, with the quantum of electric charge being the elementary charge, so that the charge number equals the electric charge ( q) in coulombs divided by the elementary-charge constant ( e), or z = q/ e. This article may need to be rewritten to comply with Wikipedia's quality standards.
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