Show me what you know!

Front

What two subatomic particles make up the nucleus of an atom?

Back

Protons and Neutrons.

Front

What is an atom or group of atoms that has gained or lost one or more electrons and is now either positively or negatively charged?

Back

Ion.

Front

When an atom loses a valence electron, what type of ion does it become?

Back

Positive ion.

Front

What is the sum of the number of protons and the number of neutrons in an atom called?

Back

Mass number.

Front

Why do all bonds form?

Back

To fill the outermost energy level.

Front

What is the smallest unit of an element that retains the properties of that element?

Back

Atom.

Front

What are the negatively charged subatomic particles in an atom?

Back

Electrons.

Front

What is the center of an atom called?

Back

Nucleus.

Front

What is the charge of a proton?

Back

Positive.

Front

What is the charge of a neutron?

Back

Neutral.