First some background...
An element is anything with only one type of atom.
In terms of Chemical structure, any time you see more than one capital letter (like H2O) that automatically it has more than one element, or more than one kind of atom.
So some examples:
H2O (Water)
NaCl (Salt)
C3H8 (Propane)
SiO2 (Sand)
C12H22O11 (Sugar)
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A couple of examples would be salt water and sugar water. The salt and sugar dissolve in the water, but still exist as smaller molecules (or in salt's case, as sodium and chlorine ions) among the water molecules.
Epsom salt is a compound. It is composed of the elements magnesium, sulfur, and oxygen bonded together in a specific ratio. It is not a pure substance like an element, but rather a combination of different elements.
A compound is a substance composed of two or more elements chemically bonded together. It has a unique chemical structure and properties different from its constituent elements. Examples include water (H2O) and salt (NaCl).
Usual table salt requires two chemical elements to exists (Na+, Cl-).
A compound is a substance formed when two or more elements are chemically joined. Water, salt, and sugar are examples of compounds. Most pure substances are compounds A compound is a substance formed when two or more elements are chemically joined. Water, salt, and sugar are examples of compounds. Most pure substances are compoundsA compound is something that has two or more atoms bound together. An example would be water, glucose, alcohol, vinegar.