'Mendeleyev didn't know about this set of gases, which includes helium & argon, so they weren't on his table'
noble/inert gases
CHEMISTRY: Mendeleyev didnt know about this set of gases, which includes helium & argon, so they werent on his table
Mendeleyev didn't know about this set of gases, which includes helium & argon, so they weren't on his table
Mendeleyev didn't know about this set of gases, which includes helium & argon, so they weren't on his table
CHEMISTRY
noble/inert gases
CHEMISTRY