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proposes the four element theory of earth, fire, water and air
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created the term 'elements' (stoicheia)
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THE PROFICIENCE AND ADVANCEMENT OF LEARNING described the SCIENTIFIC METHOD in his publication called:
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PUBLISHED A PAPER CALLED " THE SCEPTICAL CHYMIST" WHICH DESCRIBED EARLY IDEAS OF ATOMS, MOLECULES AND CHEMICAL REACTIONS
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ISOLATED CARBON DIOXIDE AND CALLED IT FIXED AIR
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BOTH ISOLATED OXYGEN ON SEPARATE OCCASSIONS
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DISCOVERED HYDROGEN
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WROTE A LIST CONTAINING 33 ELEMENTS
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DESCRIBED THE RELATIONSHIP BETWEEN THE COMPONENTS IN A MIXTURE OF GASES
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INTRODUCED A TABLE OF ATOMIC WEIGHTS AND A SYSTEM OF LETTERS TO SYMBOLIZE ELEMENTS
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DEVELOPED THREE GROUPS OF ELEMENTS WITH SIMILIAR PROPERTIES
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OBSERVED SIMILIARITIES BETWEEN ELEMENTS AND ARRANGED ELEMENTS INTO ORDER OF ATOMIC WEIGHTS
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DEVELOPED AN EARLY VERSION OF THE PERIODIC TABLE OF 28 ELEMENTS
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DEVELOPED A TABLE OF 66 ELEMENTS, BASED ON ATOMIC WEIGHTS, ARRANGED PERIODICALLY.
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DISCOVERED NOBLE GASES
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ISOLATED RADIUM AND POLONIUM FROM PITCHBLENDE
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DISCOVERED THAT RADIOACTIVITY CAME FROM DECAYING ATOMS
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IDENTIFIED NEPTUNIUM PRODUCED BY URANIUM FISSION
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SYNTHESIZED THE TRANSURANIC ELEMENTS THAT COME AFTER URANIUM IN THE PERIODIC TABLE