They never can! elements can never ever be broken down!
A substance that cannot be broken down is a pure substance
A pure substance that cannot be broken down is an Element.
element
Copper is an element and can not be broken down to a simpler substance.
An element cannot be broken down into a simpler substance by chemical means.
an element
An element is a substance that cannot be broken down into simpler substances through chemical reactions.
element
an element
An element.
An element.
molecule