Which of the following is a correct definition of an element?
A - A substance with no atoms.
B - A substance with pure metal properties
C - A pure substance that can be broken down into another substance
D - A substance that cannot combine with another substance
E - A pure substance that cannot be broken down by chemical methods into simpler components
Answer: E - A pure substance that cannot be broken down into simpler components
Elements are all unique from each other, each consisting of only one type of atom. These atoms has exactly the same chemical makeup, size and mass.