Molecules of substances cannot be broken down unless through chemical means. The bonds between atoms in molecules are too strong to break apart through other means.
Matter
An alloy.
Elements.
into smallest partical
Substances that cannot be chemically broken down into simpler substances are called elements.
Elements can't be broken down chemically into other substances because elements are what make up other things such as sugar and water, they can't be broken down further because there is nothing to break them down into.
substances that cannot be broken down chemically into other substances are
That would be an Element.
This is a chemical compound.
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.
These are the chemical elements.
Robert Boyle