1 jan 1871 ano - 8) Mendeleev noticed that when he put the atoms in order of atomic masses, some atoms were missing, so Mendeleev left spaces in the periodic table and within 15 years the missing elements were discovered confirming the acceptance of Mendeleev periodic table.
Adicionado na linha do tempo:
Data:
1 jan 1871 ano
Agora
~ 153 years ago
