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330 BCE
Aristotle's theory
Aristotle believed that everything was made up of the four roots. Earth, Water, Air, and Fire. -
Antoine Lavoisier
He created one of the first modern chemistry books and inside it contains oxygen, nitrogen, hydrogen, phosphorus, mercury, zinc and sulfur that he concluded that could not be broken down any further. -
John Dalton's discovery
John Dalton provided atomic weights to the elements that were know in his day. He also provided the ways in which he got them. -
Johann Wolfgang Döbereiner
Johann began one of the earliest attempts to classify the elements. He found that he could form the elements into groups of three that had similar properties. These he called Triads. -
Dmitri's model
In 1869, Russian chemist Dmitri Mendeleev created the first example of the modern periodic table.