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Chemistry atoms!!!!:
History of Atomic Structure
Question | Answer |
---|---|
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 |