Some elements have been made by man, but don't exist naturally. Discover which elements are found in nature and how many there are.
Meet 115, the Newest Element on the Periodic Table
Elements of Nature, Definition & List - Lesson
Isotopes
Periodic Table of Elements (PDF) - Chemical Elements with Interactive Periodic Table
How Many Elements on the Periodic Table of the Elements Occur Naturally?
How Many Elements on the Periodic Table of the Elements Occur Naturally?
How to Know Which Elements Are Liquid at Room Temperature
Chemical element - Wikipedia
Learn About the History of the Periodic Table of Chemical Elements
List Native Elements Minerals & Naturally Occurring Metals In Pure Form