The atomic number of an element whose atoms have 9 protons and 10 neutrons is

Hi,
The atomic number of an element depends on how many protons there are in a atom of that element. In your case, the atomic number of the element is 9.
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Hello thereone of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. which property fits this description? answer: atomic mass  was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.