mendeleev organized the first periodic table by atomic number. now, we organize it by instead. the alphabet…

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

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

Answer

Brief Explanations:

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

Answer:

atomic mass