Subatomic Particles and Atomic Models

The video tutorial explores the history and structure of the atom, focusing on the discovery of subatomic particles. It begins with J.J. Thompson's discovery of the electron using a cathode ray tube, leading to the development of the plum pudding model. The tutorial then covers the discovery of radioactivity by Becquerel and Curie, and Rutherford's gold foil experiment, which led to the nuclear model of the atom. The properties of protons and neutrons are discussed, highlighting their roles in atomic structure. The video concludes with a summary of subatomic particles and their characteristics.

What is the smallest unit of an element that retains its properties?

• Electron

• Proton

• Atom

• Molecule

Who discovered the electron using a cathode ray tube?

• J.J. Thompson

• Marie Curie

• Ernest Rutherford

• Robert Milliken

What did J.J. Thompson conclude about the cathode ray?

• It was composed of light

• It was composed of charged particles

• It was composed of sound waves

• It was composed of magnetic fields

What model did Thompson propose for the atom?

• Nuclear model

• Quantum model

• Solar system model

• Plum pudding model

Who discovered that certain elements emit energetic particles and rays?

• Robert Milliken

• Ernest Rutherford

• Henri Becquerel and Marie Curie

• J.J. Thompson

What did Rutherford's gold foil experiment demonstrate about the atom?

• Atoms are solid throughout

• Atoms have a dense nucleus

• Atoms are indivisible

• Atoms are made of light

What is the charge of the nucleus according to Rutherford's model?

• Variable

• Positive

• Neutral

• Negative

What particle did Rutherford propose to have the same charge magnitude as an electron but opposite in sign?

• Neutron

• Proton

• Photon

• Quark

What is the mass of a proton in atomic mass units (AMU)?

• 0.00055 AMU

• 0.5 AMU

• 1 AMU

• 1.67 AMU

Which subatomic particle has no charge?

• Photon

• Proton

• Electron

• Neutron