Complete the paragraph below using the terms listed to the left.
A substance that cannot be broken down into other substances is an __
. Carbon-14 is a(n) ___
It has a different number of neutrons than other
carbon atoms. A(n)
forms when two or more
elements combine. The chemical bond that holds the elements
together is a(n)
when electrons are shared.
A substance with this kind of bond is called a(n)
An atom that has lost or gained one or more electrons becomes a(n)
which carries an electric charge. Two of these
oppositely charged atoms can form an electrical attraction called a(n)
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