UNIT 3: Chemistry Review Semester 1

Front

What is the mole used for?

Back

To measure the amount of atoms or molecules in a substance.

Front

Isotopes of an element have a different number of...

Back

Neutrons.

Front

An atom has an atomic number of 15 and a mass number of 31. How many neutrons are there in the atom?

Back

16.

Front

Found in the nucleus of the atom

Back

Neutrons and protons.

Front

Where are electrons of an atom found?

Back

Electron Cloud.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What is the mass number of an atom?

Back

The total number of protons and neutrons in the nucleus.

Front

What are the three main subatomic particles?

Back

Protons, neutrons, and electrons.

Front

What charge do protons carry?

Back

Positive charge.

Front

What charge do electrons carry?

Back

Negative charge.