All elements are pure substances.

true

false

It can be a compound or a single element. An element is a pure substance that cannot be separated into simpler substances by chemical or physical means. There are about 117 elements, but carbon, hydrogen, nitrogen and oxygen are only a few that make up the largest portion of Earth.
hopefully that helps

Well to my expert knowledge and my exquisite calculations i think the the negative ion # 412 is the key to sucess