Why is atomic number called $Z$ ?

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Answer 1 · 2016-04-04T17:03:51

See this [site.](http://antoine.frostburg.edu/chem/senese/101/atoms/faq/why-is-atomic-number-Z.shtml)

As the site explains, $"Zahl"$ or $"Atomzahl"$ is number or atomic number $"auf Deutsch"$ .

Why is atomic number called ZZ?