HISTORY OF THE ATOMIC THEORY IMPORTANCE OF ATOMIC THEORY MAJOR CONTRIBUTORS THE “MODERN ATOMIC THEORY”

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Presentation transcript:

HISTORY OF THE ATOMIC THEORY IMPORTANCE OF ATOMIC THEORY MAJOR CONTRIBUTORS THE “MODERN ATOMIC THEORY”

DEMOCRITUS ~400 B.C. STATED THE FIRST THEORY ABOUT ATOMS ATOMOS - INDIVISIBLE

ARISTOTLE ~300 B.C. DISAGREED WITH D’S THEORY MATTER IS MADE OF HYLE (ONE STUFF BUT FORM CHANGES BY TREATMENTS)

GIORDANO BRUNO ~1600 EXECUTED B/C OF HIS THEORIES ON ATOMS

ROBERT BOYLE & ISAAC NEWTON ~1600 A.D. (WORKED INDEPENDENTLY) DISCUSSED THE POSSIBILITY OF ATOMS EXISTING PROGRESS IMPEDED BY THE CHURCH

ANTOINE LAVOISIER ~1700 A.D. KNOWN FOR HIS EXPERIMENTATION SKILLS STATED THE LAW OF CONSERVATION OF MATTER

ANTOINE LAVOISIER STATED THE LAW OF CONSERVATION OF MATTER (HINTS AT THE REARRANGEMENT OF MATTER IN REACTIONS)

JOSEPH PROUST ~1700 A.D. STATED THE LAW OF DEFINITE PROPORTIONS (HINTS AT THE “LEGO”NESS OF MATTER)

JOHN DALTON ~1800 A.D. DID “LIBRARY” RESEARCH STATED DALTON’S ATOMIC THEORY

MODERN ATOMIC THEORY DIFFERENCES BETWEEN DALTON’S AND MODERN: ATOMS CAN BE DIVIDED ATOMS OF SAME ELEMENT CAN HAVE DIFF MASSES

“WONDERINGS” Q: “What is matter made of?” A: Atoms Q: “What are ATOMS made of?” A: “hmmmmm… good question!”

HISTORY OF ATOMIC STRUCTURE

THOMSON 1897 CATHODE RAYS = e - DETERMINED THE CHARGE TO MASS RATIO DEVELOPED THE “PLUM PUDDING MODEL” OF ATOM

RUTHERFORD “EARLY 1900’S” PROPERTIES OF RADIOACTIVITY  = He +2  = e -  = LIGHT

RUTHERFORD (AGAIN) GOLD FOIL EXPERIMENT NUCLEAR MODEL

MILLIKAN Early 1910’S OIL DROP EXPERIMENT DETERMINED THE CHARGE OF AN ELECTRON THEREFORE, WE KNOW THE MASS

RUTHERFORD (YET AGAIN) 1919 PROTONS

CHADWICK 1932 NEUTRONS