Pure substances can be elements or compounds which are combinations of
* An element is a substance that cannot be broken down further by
or
processes. The smallest particle of an element is an _
Some
elements normally form
with two or more of
the same atom bonded together.
* A
_ is a substance that
can be broken down into elements by
processes. The smallest
particle of a compound is a that is made up of two or more types of atoms.