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John Daltion
• Found that there is a point where matter could not be broken down into anything smaller.
• From John’s findings they discovered more than one element always had the same relative amounts of each element. -
J. Plucker
-Built one of the first gas discharge tubes (cathode ray tube). -
Dmitri Mendeleev
-Arranged elements into 7 groups with similar properties.
-He discovered that the properties of elements were periodic functions of the their atomic weights. This became known as the Periodic Law. -
James Clerk Maxwell
-Proposed electric and magnetic fields filled the void. -
J.J Thomson
-Founded the first model of the atom 'The Plum Pudding.'
-Found positive charges mixed together with electrons. -
Marie Sklodowska Curie
-Studied uranium and thorium and called their spontaneous decay process radioactivity.
-She and her husband Pierre also discovered the radioactive elements polonium and radium. -
Albert Einstein
-Published the famous equation E=mc 2 -
R.A. Millikan
-Oil drop experiment determined the charge and the mass of an electron. -
Ernest Rutherford
-Found alpha rays through matter. -
James Chadwick
-Student of Ernest Rutherford.
-Discovered neutron.
-Found that you could calculate mass of neutron. -
Enrico Fermi
-Conducted the first controlled chain reaction releasing energy from the atoms nucleus.