Who proposed the plum pudding model of the atom after discovering electrons?

Who proposed the plum pudding model of the atom after discovering electrons?

• A. Niels Bohr
• B. Ernest Rutherford
• C. James Chadwick
• D. J. J. Thomson

Answer: (D)

When you think about how scientists first imagined the atom after discovering electrons, the intuitive move was to fit those negatively charged particles into something that could stay electrically neutral. J. J. Thomson did exactly that after his cathode ray experiments showed electrons as part of every atom. He proposed the plum pudding model, envisioning the atom as a positively charged sphere with electrons scattered throughout like plums in a pudding. This explained how atoms could be neutral yet contain negatively charged components. This idea was later challenged by Rutherford’s gold foil experiments, which revealed a tiny dense nucleus and a mostly empty atom, prompting a shift to the nuclear model. Bohr then refined the picture with quantized electron orbits, and Chadwick added the neutron to complete the picture of atomic structure.

When you think about how scientists first imagined the atom after discovering electrons, the intuitive move was to fit those negatively charged particles into something that could stay electrically neutral. J. J. Thomson did exactly that after his cathode ray experiments showed electrons as part of every atom. He proposed the plum pudding model, envisioning the atom as a positively charged sphere with electrons scattered throughout like plums in a pudding. This explained how atoms could be neutral yet contain negatively charged components.

This idea was later challenged by Rutherford’s gold foil experiments, which revealed a tiny dense nucleus and a mostly empty atom, prompting a shift to the nuclear model. Bohr then refined the picture with quantized electron orbits, and Chadwick added the neutron to complete the picture of atomic structure.