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Why is atomic number called "Z"? Why is mass number called "A"?

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"Atomic number" in German is "Atomzahl", so the Z symbol for atomic number probably comes from "Zahl" (number). In modern physics Z represents the greatest energy, nuclear power, in its potential form, nuclear charge."M is sometimes used for mass number ("Massenzahl" in German), but A is the symbol recommended...
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"Atomic number" in German is "Atomzahl", so the Z symbol for atomic number probably comes from "Zahl" (number). In modern physics Z represents the greatest energy, nuclear power, in its potential form, nuclear charge."M is sometimes used for mass number ("Massenzahl" in German), but A is the symbol recommended in the ACS Style GuideThe symbol may have been chosen so that the positions of the mass and atomic numbers are less likely to be confused in a nuclide symbol: A Z X read less
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"Atomic number" in German is "Atomzahl", so the Z symbol for atomic number probably comes from "Zahl" (number).
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