Pre-Test
Charges
Subatomic
Numbers
Modern Theory
100
This is the smallest part of an element.
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

All of the mass of an atom is concentrated here.

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

I have 16 electrons whizzing through my electron cloud.

Sulphur

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

With an atomic mass of 39 and 20 neutrons in my nucleus, I am a very reactive metal.

Potassium

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 mass number of Potassium.
What is 39.098?
400

Information that is contained within a square on the Periodic Table.

atomic number, element symbol, element name, and atomic mass

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

The region of space around the nucleus where an electron is likely to be found.

What is an orbital?

500
Mass number - atomic number = ______ __ ________.
What is the numer of neutrons?
500

Why scientists use models to study atoms.

because atoms are small to be seen.

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