What is an element ?
A substance consisting of atoms which all have the same number of protons.
What is a compound ?
A combination of two or more atoms.
What is molecule ?
A group of atoms bonded together.
What is a mixture ?
A substance made by mixing other substances together.
What is an atom ?
The basic unit of a chemical element.
What is an alloy ?
A metal made by combining two or more metallic elements.