A substance consisting of only one kind of atom.
A basic simple chemical substance which cannot be broken down into simpler substances.
Simplest chemical form, in which only one kind of atom is contained (e.g., oxygen).
A substance which cannot be decomposed by the ordinary types of chemical change, or made by chemical union. An atom is the smallest particle of an element.
In chemistry, a substance that cannot be separated into substances different from itself by ordinary chemical processes. Elements exist in free and combined states. There are 110 named elements, plus others yet to be fully characterized and named.
The simplest form of chemical matter; an element cannot be broken down into a simpler substance without a loss of identity.
A group of atoms characterized by having the same atomic number.
The fundamental component of which something is comprised. In the realm of chemistry, it refers to a substance that cannot be broken down into simpler substances through regular chemical processes and is composed solely of atoms of a single type.