- In Ancient Greece a man named Democritus figured out that every single thing in the universe must be made up of tiny particles that can’t be cut anymore. He called these particles “atoms”, which in Greek means “uncuttable”.
- An atom is the smallest particle of an element still having the same chemical properties of the element.
- The particles smaller then atom are called subatomic particles.
- At the center of the atom is a core called a nucleus, which is made up of these subatomic particles called protons and neutrons. Whizzing around the nucleus at incredible speeds are tiny particles called electrons.
- Electrons are extremely small. You could fit 2,000 of them into one proton.
- There are over 100 different kinds of atoms.
- By combining theses atoms in different ways, we can make anything in the universe.
- Atoms are so tiny that they can’t be seen, even with the most powerful microscope.
- Even though protons and neutrons make up the nucleus of an atom, most of the nucleus is empty space.
- When atoms combine together they form molecules.
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