History of the Atomic Model

History of the atom

This is the evolution of a
Mental Model

Note that the model changes as each model has to explain new observations.

What observation led to each model?

Multiple Choice

Atomos, a word created by Democritus, means what?

• Particle

• Not to be cut

• Element

• None of these

Multiple Select

Aristotle was also a philosopher. He thought that all matter was made of four elements. The four elements (to him) were

• Earth

• Air

• Wind

• Water

• Fire

Multiple Choice

Even though Aristotle was "only" a philosopher, his ideas were generally correct without any scientific proof.

• True

• False

Multiple Choice

John Dalton thought all atoms of the same element were

• identical

• random

• different

Multiple Select

He also thought that atoms were:

• Small

• Indivisible

• Made of quarks

• Made of Protons & Nutrons

Multiple Choice

JJ thomson discovered the

• Proton

• Neutron

• Electron

• None of these

Multiple Choice

JJ Thomsons revised/new model was called the

• chocolate chip model

• blueberry muffin model

• plum pudding model

• None of these

Multiple Choice

Rutherford discovered the

• Protons

• Neutrons

• Nucleus

• Electrons

Multiple Select

Rutherford proved that the nucleus was

• dense

• positive

• negative

• A myth

Multiple Choice

Thus, Rutherford concluded that the atom was mostly

• positive

• empty space

• filled with material

• Plum Pudding

Notice that there can only be 2 electrons on the inner orbit

Multiple Choice

Niels Bohr's model introduced the fact that atoms have

• specific orbits

• no mass

• no charges

• None of these

Multiple Choice

How many electrons can exist in the inner orbit of Bohr's Model?

• 2

• 3

• 5

• 8

Multiple Choice

In the modern atomic theory (Schrodinger et al.), what is the name for where the electrons exist?

• orbits

• electron cloud

• space

All done! Great job..
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