________ are the building blocks of matter.

The center of the atom that contains protons and neutrons is called the _______.

Positively charged particles that are located in the nucleus are ________.

Negatively charged particles that are located outside the nucleus are ________.

A substance that cannot be broken down into other substances is a(n) _______.

Carbon-14 is a(n) _______ because it has a different number of neutrons that other carbon atoms.

A(n) _______ forms when two or more elements combine.

The chemical bond that holds the elements together when electrons are shared is a(n) ________.

An atom that has lost or gained one or more electrons becomes a(n) ________, which carries an electric charge.

Two oppositely charged atoms (due to gaining or losing electrons) can form an electrical attraction called a(n) _________.

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