Subatomic Particles and Atomic Models

The video explores the discovery of subatomic particles: electrons, protons, and neutrons. It begins with JJ Thompson's cathode ray tube experiment, which identified the electron as a negatively charged particle with mass. The plum pudding model, which suggested atoms were composed of positive and negative charges, was later challenged by Rutherford's gold foil experiment. This experiment revealed a dense, positively charged nucleus at the atom's center. Finally, the neutron was discovered by James Chadwick through radioactive bombardment experiments, completing the understanding of the atom's structure.

Which subatomic particle is known to carry a negative charge?

• Proton

• Neutron

• Electron

• Alpha particle

Who is credited with the discovery of the electron?

• James Chadwick

• Ernest Rutherford

• Niels Bohr

• J.J. Thompson

What experiment did J.J. Thompson use to discover the electron?

• Radioactive Bombardment

• Oil Drop Experiment

• Cathode Ray Tube Experiment

• Gold Foil Experiment

What was the main idea behind the Plum Pudding Model?

• Atoms are mostly empty space

• Atoms have a dense nucleus

• Atoms consist of electrons embedded in a positive sphere

• Atoms are indivisible

Which experiment disproved the Plum Pudding Model?

• Radioactive Bombardment

• Cathode Ray Tube Experiment

• Oil Drop Experiment

• Gold Foil Experiment

What did Rutherford conclude from his Gold Foil Experiment?

• Atoms are mostly solid

• Atoms are indivisible

• Atoms have a dense, positively charged nucleus

• Electrons orbit the nucleus in fixed paths

What was unexpected about the results of the Gold Foil Experiment?

• Alpha particles changed color

• Alpha particles were absorbed

• Some alpha particles were deflected

• All alpha particles passed through

Who discovered the neutron?

• Ernest Rutherford

• Niels Bohr

• J.J. Thompson

• James Chadwick

Why was the neutron difficult to detect?

• It is too small

• It is neutral and has no charge

• It has a negative charge

• It has a positive charge

What method did James Chadwick use to discover the neutron?

• Oil Drop Experiment

• Cathode Ray Tube Experiment

• Radioactive Bombardment

• Gold Foil Experiment