The History?
The periodic table
was first published in 1869 by Dmitri Mendeleev. Scientists before him, such as Johann Wolfgang Dobereiner, suspected
there was a way to group elements. This scientist in particular grouped the known
elements in 1829 into triads, based on atomic weight. In 1864, John Newlands
grouped all of the known elements into eight different groups, based solely on
physical properties. Dmitri used other scientists’ data such as this to form
the first table we have that is similar to the one we use today. His model had
holes and predicted several elements we know of today.
Over
the next 150 years, hundreds of scientists have worked together to create a
table that has 118 elements, 92 of which can occur naturally.
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