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Pre-Test
Charges &Valence electrons
Subatomic
Numbers
Isotopes
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

Isotopes are atoms with the same number of protons but different numbers of ?

What are neutrons?

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

What is the mass number of the most common isotope of Lithium?

What is 7?

300
Electrons are located outside of the nucleus. True or False?
True!
300

How many valence electrons in Calcium?

2

300
Located inside of the nucleus and have a positive charge.
What are protons?
300
The atomic number of Oxygen.
What is 8?
300

How many neutrons are in a P-31 atom?

What is 16?

400
Protons and neutrons are about the same size. True or False?
True!
400

How many valence electrons are in Phosphorus?

5

400
Atoms of different elements have different numbers of these.
What are protons?
400

The mass number of the most common isotope of Potassium.

What is 39?

400

An atom has 18 protons, 18 electrons, and 20 neutrons.  What is the symbol and mass number of this particular atom?

What is Ar-38?

500
This is the smallest subatomic particle.
What is an electron?
500

How many valence electrons are in chlorine?

What is 7?

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

How many protons, electrons, and neutrons are in the most common isotope of chlorine?

What is 17 protons, 17 electrons, and 18 neutrons?