Which of the following statements is/are true? I. John Dalton provided the first experimental support for the atom.
II) Ernest Rutherford proved the existence of a nucleus by shooting positively charged particles at a thin gold-foil sheet.
III) J. J. Thompson proved that electrons travel in elliptical orbits around the nucleus.
IV) Energy in an atom is quantized, so when electrons fall to their ground state, white light can be observed.

Question

Quizplus · Accepted Answer

John Dalton provided the first experimental support for the atom with his atomic theory. Ernest Rutherford demonstrated the existence of a nucleus through his gold foil experiment. J. J. Thompson discovered the electron but did not prove that electrons travel in elliptical orbits; this was later developed by others. Energy in an atom is quantized, but when electrons fall to their ground state, specific wavelengths of light are emitted, not white light.

Which of the Following Statements Is/are True? I