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Pre-Test
Charges
Subatomic
Numbers
Atomic Theory
100

The building block of all types of matter.

What is an atom?

100
Objects with the same charge do this when they come close to each other.
What is repel?
100

Three subatomic particles.

What are protons, neutrons, and electrons?

100
The sum of protons and neutrons in the nucleus of an atom.
What is mass number?
100

Rutherford discovered this key part of the atom.

What is the nucleus?

200
Neutrons are located outside of the nucleus. True or False?
False!
200
Objects with different charges do this when they come close to each other.
What is attract?
200
Located outside of the nucleus and have a negative charge.
What are electrons?
200
The number of protons in an atom of a certain element.
What is atomic number?
200

The cathode ray tube experiment led to the discovery of which subatomic particle.

What is an electron?

300
Electrons are located outside of the nucleus. True or False?
True!
300
When an atom gains an electron it has this kind of electrical charge.
What is negative?
300
Located inside of the nucleus and have a positive charge.
What are protons?
300
The atomic number of Oxygen.
What is 8?
300

This scientist was the first to come up with a name for the atom but had no experimental evidence. 

Who is Democritus?

400
Protons and neutrons are about the same size. True or False?
True!
400
When an atom loses an electron it has this kind of electrical charge.
What is positive?
400
Atoms of different elements have different numbers of these.
What are protons?
400

The atomic mass of Potassium.

What is 39.098?

400

This scientist created the current model of the atom (Planetary model).

Who is Bohr?

500
This is the smallest subatomic particle.
What is an electron?
500
An atom that is neither positively or negatively charged.
What is neutral?
500
An atom with the same number of protons but different number of neutrons.
What is an isotope?
500
Mass number - atomic number = ______ __ ________.
What is the numer of neutrons?
500

This scientist was the first to disprove the idea that atoms could not be broken down into smaller particles.

Who is JJ Thomson?