An element.
An element cannot be broken down into a simpler substance by chemical means.
No. Elements cannot be broken down into simpler substances in a chemical reaction.
an element is a substance that cannot be broken down into a simpler form by chemical means
The atom cannot be broken by chemical methods.
All of the elements of the Periodic Table cannot be broken down into simpler substances.
An element is a pure substance that cannot be broken down into simpler substances by chemical means.
An element is a substance that cannot be broken down into simpler substances through chemical reactions.
This is the atom of a chemical element (of course by chemical methods).
Substance A is likely an element, as it cannot be broken down by a chemical change. Substance Z is likely a compound, as it can be broken down by a chemical change into simpler substances. From this information, it can be concluded that substances A and Z have different chemical compositions and properties.
cannot be broken down into simpler substances by chemical means
A pure substance that cannot be broken down into simpler substances by physical or chemical means is an element. This is because Elements can't be broken down chemically into other substances because there is nothing to break them down into.
An element.