Question

What is a pure substance that cannot be broken down by chemical or physical means?

Answer 1

Hint: All on the planet is made up of matter, which has mass and volume. The matter is further subdivided into solid, liquid, and gaseous states. Matter that is composed of that is made up of the same material throughout. Aside from that, it's divided into pure substances and mixtures.

Complete step by step answer:
Pure substances are substances that have a fixed or constant structure and are made up of just one type of particle. Pure substances have fixed physical and chemical properties. Elements and compounds are subcategories of pure substances.
 An element is a substance that is made up of only one kind or shape of atom. A pure material that cannot be broken down or transformed into another substance by physical or chemical means is referred to as an element. Just a few elements make up the majority of the earth's mass, which is made up of around 117 elements. Metals, non-metals, and metalloids are the most common elements.
Examples: Carbon, Oxygen, Nitrogen, Hydrogen.

Additional Information:
An atom is the smallest part of an element. Its composition defines the element's unique properties. The nucleus of an atom is made up of protons and neutrons. The number of protons in all atoms of the same product is the same.

Note:
An element is a chemical material made up of a specific type of atom that cannot be broken down or converted into another element by a chemical reaction. An element's atoms all have the same number of protons, but different numbers of neutrons and electrons.