See Atom.

Any material that is composed of only one type of atom. It is also called a basic element or just an element.(Basic Science/Electricity/elements.htm)

Substance that makes up matter.

any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter

a material consisting of one type of atom , such as hydrogen , oxygen , or iron

a substance that cannot be broken down chemical into simpler substances

a substance that cannot be divided or changed into different substances by ordinary chemical methods

a substance that cannot be divided or changed into di

a substance that can not be separated into

a substance that consists of only one kind of atom

a substance that contains only one kind of atom

a substance which cannot be divided into smaller chemical parts

the simplest form of matter; cannot be broken down; comprise only one type of atom

A fundamental substance comprising one kind of atom; the simplest form of matter.

A chemical element, often called simply an element, is a substance that cannot be decomposed or transformed into other chemical substances by ordinary chemical processes. All matter consists of these elements and as of 2006, 117 unique elements have been discovered or artificially created. The smallest particle of such an element is an atom, which (except in the case of the simplest and most common element hydrogen) consists of multiple electrons centered about a nucleus composed of protons and neutrons.