N-N

O-C-O

C-C-C-C

H-O-H and C-H-O and H-O-H

O-O-O

Na-Na-Na-Na

H-N-H

O-S-O

C-H4

NaCl and I-I

H-Cl and Ca-C-O and H-O-H

K-O-H and H-Br and H-N-O

O-O and N-N and Ar and O-C-O

Ca-O

Cl-Mg-Cl and O-H-O

A substance with physical and chemical properties that cannot be broken down into a simpler substance.

Two or more different atoms joined together.

Two or more different atoms or compounds around each other, but not joined.

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