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Atomic History and Structure Questions and Answers
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Atomic History and Structure
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Atomic History and StructureAtom - answerUnit that makes up an element.
Proton - answerNucleus, Positive, Same size as neutron.
Neutron - answerNucleus, no charge, size is the same as a proton.
Electron - answerOutside nucleus, negative charge, size is much smaller than a proton
or neutron.
Atomic number - answerNumber of protons in and Atom
Mass number - answerGa - 71
71/31Ga
Neutrons - answerMass Number - atomic number
Mass - answerProtons + neutrons
Isotopes - answerSame element different number of neutrons
Democritus - answerFirst to say matter is made of invisible parts
John Dalton - answerModern atomic Theory
J.J. Thomson - answerDiscovered electron using Cathode ray
J.J. Thomson - answer"Plum Pudding"
Rutherford - answerAlpha particle, gold foil, empty space, positive center
Max Planck - answerAtom absorbs and emit energy
Chadwick - answerNucleus is too heavy, neutron was discovered
Bohr - answerElectrons traveled in fixed paths
Quantum mechanical model [cloud model] - answerElectrons occupy different parts of
clouds.
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