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Chemistry atoms!!!!:

History of Atomic Structure

QuestionAnswer
Who was the first to give atoms their names? Democritus
Who concluded that all matter is composed of atoms, are indivisible, and are identical in the same element? John Dalton
Who discovered that cathode rays must be made of negatively charged particles called electrons? JJ Thomson
Who discovered the charge of an electron? Robert Millikan
Who concluded that atoms have a small dense center that is positively charged? (he discovered the proton) Rutherford
Who discovered the neutron in the nucleus? James Chadwick
Who discovered the periodicity of elements ( atomic number? Henry Mosely
Who found that electrons orbit around the nucleus? Neils Bohr
What is Planck's constant? 6.63x10 -34(power)J/S
Created by: cman25
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