Many scientists found
that triads (chemical
relationships expanded
beyond the triad). (1 gen 1829 anni – 1 gen 1858 anni)
Descrizione:
During this time fluorine was added
to the halogen group; oxygen, sulfur,selenium and tellurium were grouped into a family while nitrogen,
phosphorus, arsenic, antimony, and bismuth were classified as another.
Aggiunto al nastro di tempo:
Data:
1 gen 1829 anni
1 gen 1858 anni
~ 29 years