1) Democritus proposed which of the following theories? a) Protons exist in a nucleus b) The plum pudding model c) All matter has the same structure d) He proposed that all matter is made up of small units called atom 2) J.J. Thompson discovered which particle? a) Neutron b) Proton c) Electron d) Higgs-Boson 3) Ernest Rutherford's gold leaf experiment proved which of the following statements? a) Atoms a packed full of electrons b) The positive charge is centralised in an atom c) Gold absorbs electrons d) Gold particles reflect electrons 4) Chadwick discovered which of the following particles? a) Neutron b) Electron c) Nucleus d) Proton 5) Neils Bohr suggested which of the following ideas? a) Electrons are concentrated in the nucleus b) Electrons are found in distinct shells or energy levels c) Electrons don't move d) Shells all have the same energy 6) Which was discovered first? a) Electron shells b) Electrons c) Protons d) Neutrons 7) Who suggested the plum pudding model? a) Neils Bohr b) Ernest Rutherford c) J.J. Thompson d) John Dalton
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History of the atom
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