Catedrático de física de la materia condensada

Atom

In chemistry and physics, an atom (Greek άτομος or átomos meaning "indivisible") is the smallest possible particle of a chemical element that retains its chemical properties. The word atom originally meant the smallest possible indivisible particle, but after the term came to have a specific meaning in science, atoms were found to be divisible and composed of smaller subatomic particles. Most atoms are composed of three types of subatomic particles which govern their external properties:

• electrons, which have a negative charge and are the least massive of the three.
• protons, which have a positive charge and are about 1836 times more massive than electrons.
• neutrons, which have no charge and are about 1839 times more massive than electrons.