They can change and undergo chemical reactions, sharing electrons with other atoms. There are 92 natural elements and up to 118 when you count in man-made elements.Ītoms last a long time, in most cases forever. Each different kind of atom makes up an element. There are different kinds of atoms based on the number of electrons, protons, and neutrons each atom contains. Suffice it to say that the number is trillions and trillions (and then some more).
There are so many atoms in a single human body we won't even try to write the number here. It takes a lot of atoms to make up anything. Atoms fit together with other atoms to make up matter. The basic particles that make up an atom are electrons, protons, and neutrons. Atoms are extremely small and are made up of a few even smaller particles. The atom is the basic building block for all matter in the universe.
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