If it is an element, then by definition there is nothing else present.
Mercury is a chemical element.
does not include other substances
ReactivityThe ease and speed with which an element combines with other elements and compounds is called the "reactivity" of the element.
substances that cannot be broken down chemically into other substances are
Calcium is itself an element. Elements do not contain other substances.
Since aluminum is a chemical element it contains no other substances.
does not include other substances
No
A one element substance is a pure substance. It is not mixed physically or chemically with other substances or elements.
This is called an element.
That is a fairly good definition for an "Element".
Mercury is an element and is therefore a pure substance. There are no other elements in it.