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Atom

7:45

Basic Atomic Structure: A Look Inside the Atom

4:58

How Small Is An Atom? Spoiler: Very Small.

13:37

HOW IT WORKS: The Atom (720p)

13:31

7.2 Introduction to Atomic Structure

21:05

Introduction to the atom | Chemistry of life | Biology | Khan Academy

An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small; typical sizes are around 100 picometers.
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