Atomic Structure and Subatomic Particles

This video tutorial covers the evolution of atomic models, starting with the Plum Pudding model and its replacement by the nuclear model due to the alpha scattering experiment. It explains the nuclear model's structure, including the positive nucleus and surrounding electrons. The video further discusses modifications to the nuclear model, such as electron energy levels, protons, and neutrons. It provides details on atomic sizes, relative charges, and masses of subatomic particles, emphasizing the importance of these concepts for exams.

What experiment led to the replacement of the Plum Pudding model with the nuclear model?

• Beta decay experiment

• Alpha scattering experiment

• Gamma ray experiment

• Electron diffraction experiment

In the nuclear model, where is most of the atom's mass located?

• Evenly distributed throughout the atom

• In the electron cloud

• In the nucleus

• In the atomic shell

Who proposed that electrons orbit the nucleus at specific distances?

• Ernest Rutherford

• James Chadwick

• Neils Bohr

• Albert Einstein

What are the orbits of electrons around the nucleus now called?

• Atomic rings

• Energy levels or shells

• Proton paths

• Electron clouds

What determines the positive charge in the nucleus of an atom?

• Quarks

• Protons

• Electrons

• Neutrons

How many protons does a helium atom have in its nucleus?

• Four

• One

• Two

• Three

Who discovered the neutron?

• James Chadwick

• Neils Bohr

• Ernest Rutherford

• Marie Curie

What is the approximate radius of an atom?

• 1 * 10^-10 m

• 1 * 10^-14 m

• 1 * 10^-7 m

• 1 * 10^-12 m

What is the relative charge of a neutron?

• Negative one

• Zero

• Positive one

• Positive two

Which particle has a much smaller relative mass compared to protons and neutrons?

• Neutron

• Electron

• Proton

• Photon