An element!
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.
Element
Elements.
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.
A substance that can not be decomposed into simpler substance by a chemical or physical means is a chemical element.
All substances can be broken into any other substances (or elements) by chemical or physical methods.
An element is a substance that cannot be broken down into other substances by chemical or physical means. It consists of atoms with the same atomic number and unique set of properties. Examples of elements include hydrogen, oxygen, and gold.
The simplest substance that you can obtain by ordinary means is an element.An element is a substance than cannot be separated or broken down into simpler substances by chemical means.
An element is a pure substance that cannot be broken down into simpler substances by chemical means.
Is a pure substance such as an element. Remember elements can not be broken down further by chemical or physical processes.
A chemical element, by definition.