3 Atomic History

Proposed that electrons orbited the nucleus in circular orbits.

• Rutherford
• Bohr
• Chadwick

• Schrodinger

Used cathode rays to discover the electron.

• Dalton
• Thomson
• Rutherford
• Bohr

Discovered the neutron in 1932.

• Bohr
• Chadwick
• Schrodinger
• Millikin

Tags

NGSS.HS-PS1-8

Coined the term “atom” and believed the atom was an indivisible sphere.

• Heisenberg
• Democritus
• Aristotle
• Dalton

Used quantum numbers to describe the location of electrons in a 3-D atomic model.

• Chadwick
• Schrodinger
• Millikin
• Heisenberg
• Option 5

Concluded that atoms had a dense, positively charged inner core called a nucleus.

• Bohr
• Thomson
• Chadwick
• Rutherford

Tags

NGSS.HS-PS1-8

Proposed five postulates about the atom.

• Democritus
• Aristotle
• Dalton
• Debroglie

Introduced the wave/particle duality of electrons.

• Debroglie
• Heisenberg
• Millikin
• Schrodinger

Tags

NGSS.HS-PS4-3

Produced the mathematical “Uncertainty Principal”, where it is impossible to know both the location and the velocity of the electron.

• Schrodinger
• Millikin
• Heisenberg
• Debroglie

Discovered the mass and charge of the electron with his “Oil Drop” experiment.

• Chadwick
• Debroglie
• Millikin
• Schrodinger