Element
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
An element is a pure substance that cannot be broken down into simpler substances by ordinary chemical changes.
Show
Heating pure iron, however strongly, never separates it into two or more different substances.
Watch for
A sample looking uniform does not make it an element — check whether it resists chemical breakdown, not only its appearance.