Early Atomic theory
Dalton's Atomic Theory
Thomson's Atomic Theory and Milikan
Rutherford's Atomic Theory
isotopes
100
This man believed that all matter was made up of extremely small particles that could not be divided.
What is Democritus
100

In chemical reactions, atoms are combined, separated, or rearranged but this is conserved.

What is mass 

100

Thomson was the first person to discover that atoms had _______.

What are electrons 

100
The fast moving postively charged particles that are emitted from uranium.
What are alpha particles?
100

carbon-14 number of neutrons

8

200
The Greek word atomos means this
What is uncut or indivisible?
200
Dalton's atomic theory was developed around how atoms of different elements combined to form these.
What are compounds?
200

Thomson used an ________ _________ to discover the electron

What is cathode ray tube

200
Rutherford's main discovery.
What is the nucleus?
200

mass number of fluorine with 10 neutrons

What is 19

300
This man believed that all matter was made up of four elements.
What is Aristotle?
300
Compounds have fixed ____________.
What are compositions?
300

Common model of Thomson's atomic theory

What is plum pudding 

300
The positively charged particles bounced back in Rutherford's experiment because they hit the _________.
What is postively charged nucleus.
300

atomic number 26

 number of neutrons 30

What are iron-56

400
These are the four elements that a Greek philosopher thought all matter was made of.
What is Earth, Fire, Water, Air
400
A compound contains atoms of more than one ___________.
What is element?
400

The glowing beam of light (cathode ray) in his experiment was attracted to (positive/negative) plate.

What is positive?

400

Describe Rutherford's hypothesis based on Thomson's atomic model.

All of the particles should continue straight through the gold foil.

400

mass number of silicon with 16 neutrons

30

500
The reason Democritus's model was not as accepted as Dalton's model.
What is lack of experiemental evidence?
500

True or False: all atoms of the same element are exactly the same.

What is false

500
Milikan's experiment that determined the charge of an electron

What is the oil drop experiment?

500

This showed the atom is mostly empty space

What is most of the alpha particles went straight through

500

Mass number of titanium with 26 neutrons

48

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