// todo need optimize like in event.jsp. Add indexing or not indexing this page. Many scientists found that triads (chemical relationships expanded beyond the triad). (1 jan 1829 ano – 1 jan 1858 ano) (Linha do tempo)

Many scientists found that triads (chemical relationships expanded beyond the triad). (1 jan 1829 ano – 1 jan 1858 ano)

Descrição:

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.