Step-by-step explanation:
An element is a substance that consists of only same type of atoms.
For example, a piece of aluminium metal contains only atoms of aluminium.
An element can never be separated into simpler atoms or substances.
On the other hand, a compound is a substance that contains different atoms which are combined chemically in a fixed ratio by mass.
For example, KCl is a compound and it can be broken down into toms of potassium and chlorine.
Thus, we can conclude that an element cannot be separated into simpler substances.