History of the Atom Test Review

Greek philosopher that said all matter is made of tiny particles called atoms

• Plato

• Aristotle

• Democritus

• Socrates

any substance that cannot be broken down into simpler substances

(a)  

Ratios of elements in substances always remains the same. Ex - two times more H than O when breaking down water into elements.

• The discovery made in 1911

• The discovery made in 1794

• The discovery made in 1897

• The discovery made in 1932

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negatively charged subatomic particles

• Neutron

• Proton

• Negatron

• Electron

J.J Thomsons' model of an atom, in which he thought electrons (the plums) were randomly spread out within a positively charged region (the pudding)

• Plum Pudding Model

• Nuclear Model

• Particle Model

• Electron Cloud Model

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Overall charge of an atom, number of negative charges are balanced out by the same number of positive charges.

(a)  

Rutherford's model of the atom,small positively charged nucleus issurrounded by electrons.

• Particle Model

• Plum Pudding Model

• Nuclear Model

• Bohr Model

Almost all alpha particles passed through empty space of gold atoms. 1/10,000 interacted with nucleus and bounced back.

• Cathode Ray Tube Experiment

• Light Emission Experiment

• Thought Experiment

• Gold Foil Experiment

Charge of the Nucleus

• Neutral

• Positive

• Negative

• All the charges together

The interaction that takes place between two positive particles.

(a)  

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