Atomic Theory Lesson

Atomic Theory

Page 31

Multiple Choice

All of the following of Dalton's theories were correct EXCEPT - 

• All atoms are identical.
• All matter is made of atoms.
• Chemical reactions rearrange atoms.
• Compounds contain different atoms.

Multiple Choice

Which model is the Plum Pudding Model?

Multiple Choice

What scientist is best known for his "Plum Pudding" model of the atom?

• J.J. Tomson
• Ernest Rutherford
• John Dalton
• Democritus

Multiple Choice

What did Thomson discover?

• electron
• proton
• neutron
• electron cloud

Multiple Choice

What did Rutherford discover about atoms?

• An atom is always negatively charged.

• An atom is mostly empty space, but has a dense positively charged center(nucleus).

• An atom is always positively charged.

• All particles will pass straight through gold foil with no change in path.

Multiple Choice

What two particles would you find in the nucleus of an atom?

• Protons and electrons

• Neutrons and electrons

• Protons and neutrons

• Electrons and negatrons

Multiple Choice

He developed the planetary model of the atom.

• Rutherford
• Bohr
• Chadwick
• Dalton

Multiple Choice

Which model is the Planetary Model?

Erwin Schrödinger (1926 / Austria)

​Known For: Quantum mechanics

electrons can only exist in specified energy states

Experiment:
mathematical equations

Visual Representation
"Electron Cloud model"

Multiple Choice

Which model is the Electron Cloud Model?

James Chadwick (1932 / England)

​Known For: Discovered neutrons

neutral particles in the nucleus of an atom

Experiment:
mathematical equations (atom was too heavy with just protons)

Visual Representation
"Quantum model"

Richard Feynman

• discovered the electron cloud

• said electrons are most likely to be found at specific distances from the nucleus in what he called and electron "cloud"

• energy levels are not two dimensional paths but are three dimensional shells

• Electron Cloud Model