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Created byNathan GREEN
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1669 - German alchemist
Hennig Brand discovers
phosphorus when trying
to make gold from urine.
He attempted this by
heating boiled urine, and
a liquid dropped out and
burst into flames.
←Phosphourous1680 - Robert Boyle
also discovers
phosphorous and
the discovery is
made public.
←Robert Boyle1809 - At least 47
elements are discovered,
and scientists begin to
see patterns in their
properties.1863 - English chemist
John Newlands divides
the known 56 elements
into 11 groups, based
on their characteristics.
← Part of John Newlands'
periodic table1789 - Antoine Lavoisier
wrote the "Traité
Élémentaire de Chimie"
(Elementary Treatise of
Chemistry), was considered
the first modern textbook
about chemistry. It
contained a list of "simple
substances"; an early
periodic table.
←Antoine's table1869 - Russian chemist
Dmitri Mendeleev started
the development of the
periodic table, arranging
chemical elements by
atomic mass. He predicted
the discovery of other
elements, and left spaces
open in his periodic table
for them.
←Dmitri Mendeleev1945 - Glenn Seaborg
identified lanthanides
and actinides, which
are usually placed
below the periodic
table.
←Glenn Seaborg
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