A chemical element, by definition.
An element.
Any element.
substances that cannot be broken down chemically into other substances are
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.
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.
A substance that cannot be broken down is a pure substance
An element is a pure substance that cannot be broken down into simpler substances by chemical means.
They are the simplest of substances and cannot be broken down into any other substance.
This is called an element.
Elements are substances that coonono be broken down in a garbage disposal.
An element is a pure substance that can not be broken down by chemical means into other substances. A compound is a pure substance that cannot be broken down by physical means but it can be broken down by chemical means.
If an unknown substance cannot be broken down into simpler substances it is made of one kind of atom and an element.