what is atom????????????????
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An atom is the smallest unit of ordinary matter that forms a chemical element. Every solid, liquid, gas, and plasma is composed of neutral or ionized atoms. Atoms are extremely small, typically around 100 picometers across.
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Atoms are the basic units of matter and the defining structure of elements. The term "atom" comes from the Greek word for indivisible, because it was once thought that atoms were the smallest things in the universe and could not be divided.
Different Kinds of Atoms....
Atoms are made of tiny particles called protons, neutrons and electrons. ...
- Stable. Most atoms are stable. ...
- Isotopes. Every atom is a chemical element, like hydrogen, iron or chlorine. ...
- Radioactive. Some atoms have too many neutrons in the nucleus, which makes them unstable. ...
- Ions. ...
- Antimatter.
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