The atom - unbreakable by chemical processes.
All substances can be broken into any other substances (or elements) by chemical or physical methods.
No: Compounds are simple mixtures of substances
The simplest pure substances that cannot be broken down into any other substances are elements. Elements are made up of only one type of atom and cannot be separated into simpler substances by ordinary chemical reactions. Examples include hydrogen, oxygen, and carbon.
molecule
This is called an element.
All substances can be broken into any other substances (or elements) by chemical or physical methods.
elements
Not: atoms The answer is an element
element
That is a fairly good definition for an "Element".
No: Compounds are simple mixtures of substances
You think to atoms of chemical elements.
The simplest pure substances that cannot be broken down into any other substances are elements. Elements are made up of only one type of atom and cannot be separated into simpler substances by ordinary chemical reactions. Examples include hydrogen, oxygen, and carbon.
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.
molecule
They are the simplest of substances and cannot be broken down into any other substance.
This is called an element.