Proton

What is a Proton?

A proton is a tiny particle that is found in the center of every atom. It has a positive electric charge, which means it pulls toward it particles with a negative charge, like electrons. Protons and another type of particle called neutrons make up the nucleus, or center, of an atom.

The number of protons in an atom tells us what kind of element it is. For example, all hydrogen atoms have one proton, and carbon atoms have six protons. This number is very important in science.

Where Did the Word "Proton" Come From?

The word "proton" comes from a Greek word meaning "first." Scientists discovered protons in the early 1900s while studying tiny particles. At first, they thought protons were simple building blocks of all matter. But we now know they are made of even smaller parts called quarks. A proton is made of three quarks: two up quarks and one down quark.

Why Are Protons Important?

Protons are very important in science and medicine. They are used in special machines to help treat some kinds of cancer, in a process called proton therapy. They are also used in big research places like the Large Hadron Collider to learn about the basic nature of matter. Even though protons are very small, they help shape how everything in the universe is made and works.