12. which of the following statements are true about thomsons discovery of electron properties? select two…

12. which of the following statements are true about thomsons discovery of electron properties? select two correct answers. he used gold foil to prove electrons are positive. his experiment focused only on neutrons and neutrinos. his experiment showed all atoms have negatively charged particles. the mass of the proton was measured as part of his experiment. he used a plum pudding model to demonstrate the structure of an atom.

12. which of the following statements are true about thomsons discovery of electron properties? select two correct answers. he used gold foil to prove electrons are positive. his experiment focused only on neutrons and neutrinos. his experiment showed all atoms have negatively charged particles. the mass of the proton was measured as part of his experiment. he used a plum pudding model to demonstrate the structure of an atom.

Answer

Brief Explanations:

  1. Analyze each option:
    • "He used gold foil to prove electrons are positive": Rutherford used gold foil, and electrons are negative, so this is false.
    • "His experiment focused only on neutrons and neutrinos": Thomson's work was on electrons, not neutrons/neutrinos, so false.
    • "His experiment showed all atoms have negatively charged particles": Thomson's cathode - ray experiment showed electrons (negative particles) exist in all atoms, so this is true.
    • "The mass of the proton was measured as part of his experiment": Thomson's work was on electrons, not proton mass measurement, so false.
    • "He used a plum pudding model to demonstrate the structure of an atom": Thomson proposed the plum pudding model to show atom structure with electrons in a positive "soup", so this is true.

Answer:

  • His experiment showed all atoms have negatively charged particles.
  • He used a plum pudding model to demonstrate the structure of an atom.