#6 chemistry a schoology mendeleev organized the first periodic table by now, we organize it by instead. the…

#6 chemistry a schoology mendeleev organized the first periodic table by now, we organize it by instead. the alphabet atomic number atomic mass how common elements are radioactivity

#6 chemistry a schoology mendeleev organized the first periodic table by now, we organize it by instead. the alphabet atomic number atomic mass how common elements are radioactivity

Answer

Brief Explanations:

Mendeleev organized the first periodic table by atomic mass. Now, the periodic table is organized by atomic number.

Answer:

atomic number