What is the difference between a mixture, compound, element and pure substance

Mixture = combination of two or more different chemical compounds or elemental substances

Compound = is composted of at least two different types of elements

element = something found on a periodic table

Pure substance = a material that has a constant compisition

mixture = when two or more substances combine without making a new substance.

compound = elements that are bonded together chemically

element = the simplest form of matter that cannot be broken down

pure substance = a substance made up of one compound

basically the differences are their definitions : D