This video tutorial covers the basics of atomic theory and atomic structure, focusing on the historical development and key figures like John Dalton, J.J. Thompson, Robert Milliken, and Ernest Rutherford. It explains the four tenets of modern atomic theory, the structure of atoms including protons, neutrons, and electrons, and the concept of isotopes. The video also discusses how atomic mass is calculated using weighted averages of isotopes, providing a comprehensive overview of the topic.

Which of the following is NOT one of the four tenets of modern atomic theory?

• All matter is composed of atoms.

• Atoms combine in whole number ratios to form compounds.

• Atoms of the same element are identical.

• Atoms can be converted into other elements by chemical reactions.

Who is considered the father of modern atomic theory?

• Ernest Rutherford

• John Dalton

• Robert Milliken

• J.J. Thompson

What did J.J. Thompson discover?

• Proton

• Neutron

• Electron

• Nucleus

Which experiment is Robert Milliken famous for?

• Gold foil experiment

• Cathode ray experiment

• Oil drop experiment

• Double-slit experiment

What did Ernest Rutherford discover through his gold foil experiment?

• Electron

• Nucleus

• Neutron

• Proton

Tags

NGSS.HS-PS1-8

Which subatomic particle is positively charged?

• Photon

• Electron

• Neutron

• Proton

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

• 10 amu

• 0.0005 amu

• 100 amu

• 1 amu

What does the atomic number of an element represent?

• Number of isotopes

• Number of protons

• Number of electrons

• Number of neutrons

What is an ion?

• An atom with a different number of neutrons

• A neutral atom

• A charged atom

• An atom with a different number of protons

How is the atomic mass of an element on the periodic table determined?

• By measuring the mass of a single atom

• By counting the number of protons

• By adding the number of protons and neutrons

• By averaging the masses of all its isotopes