Subatomic Particles and Atomic Theory

This video reviews key concepts of atomic theory for an honors chemistry exam. It covers the historical development of atomic models, the discovery of subatomic particles like electrons, protons, and neutrons, and the experiments that led to these discoveries. The video also explains how to calculate atomic mass and the importance of isotopes, providing examples using the periodic table.

Who is considered the father of atomic theory?

• Democritus

• John Dalton

• Ernest Rutherford

• JJ Thompson

What was the first subatomic particle discovered by JJ Thompson?

• Photon

• Neutron

• Electron

• Proton

Which experiment led to the discovery of the nucleus?

• Gold Foil Experiment

• Cathode Ray Tube Experiment

• Oil Drop Experiment

• Plum Pudding Model

What did the gold foil experiment demonstrate about the atom?

• Atoms are indivisible

• Atoms are mostly empty space

• Atoms have a dense nucleus

• Atoms have a negative charge

Who discovered the neutron?

• JJ Thompson

• James Chadwick

• Ernest Rutherford

• Niels Bohr

What is the charge of a neutron?

• Variable

• Negative

• Neutral

• Positive

Which subatomic particle has a negligible mass?

• Neutron

• Proton

• Photon

• Electron

How do you calculate the mass number of an atom?

• Add the number of protons and electrons

• Subtract the number of electrons from protons

• Add the number of protons and neutrons

• Multiply the number of protons by neutrons

What is the atomic number of an element?

• The sum of protons and neutrons

• The number of electrons

• The number of neutrons

• The number of protons

How do you determine the number of electrons in an ion?

• Divide the atomic number by the charge

• Multiply the charge by the atomic number

• Subtract the charge from the atomic number

• Add the charge to the atomic number