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Period: to
Periodic Table of Elements timeline
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Antoine Lavoisier
Comes up with a list of 33 elements (first extensive list)
Distinguished metals from non-metals -
Daltons Law
John Dalton proposes law describing the relationship between the components in a mixture of gases. (Looks a bit too much like Gabe Newell) -
Those letters
Jakob Berzelius developed a table of atomic weights & introduced letters to symbolize elements -
Grouping elements
Johann Dobereiner developed groups of 3 elements with similar properties -
John Newlands
John Newlands arranged the known elements in order of atomic weights & observed similarities between some elements -
Early periodic table rearranged
Lothar Meyer develops an early version of the periodic table, with 28 elements organized by valence -
First periodic table
Dmitri Mendeleev produced a table based on atomic weights but arranged 'periodically' with elements with similar properties under each other. His Periodic Table included the 66 known elements organized by atomic weights. -
Noble Gases
William Ramsay discovered the Noble Gases. It was hard to discover and took so long because Noble Gases hardly react with anything. -
Poor Marie Curie
Marie and Pierre Curie isolated radium and polonium from pitchblende. This was a great strive in science, finding out about radioactivity and its harmful effects on the human body unfortunately. -
For Marie Curie
Ernest Rutherford discovered the source of radioactivity as decaying atoms. Mrs. Curie didn't die painfully for nothing. -
The Atomic Number
Henry Moseley determined the atomic number of each of the elements and modified the 'Periodic Law'. He determined the atomic number by the number of protons the element contains, for that number is never changing, it's what determines the element. -
Transuranic elements
Glenn Seaborg synthesised transuranic elements. Which were the elements after uranium in the periodic table.
