Sagot :
Answer:
Dimitri Mendeleev developed the periodic elements by atom masses, and left some space for future discoveries some of scientists also grouped periodic table by radioactivity, metals, non metals or chemical and physical elements.
Answer:
Dimitri Mendeleev developed the periodic elements by atom masses, and left some space for future discoveries some of scientists also grouped periodic table by radioactivity, metals, non metals or chemical and physical elements.