Learn what an atom is, how it is composed of subatomic particles, and how it is the basic unit of matter. See a diagram of an atom with its parts labeled and examples of different elements and their atoms.

Learn how atoms are composed of subatomic particles and how they are arranged in the nucleus and the electron shells. Find out the properties and symbols of the elements and the concept of isotopes.

Learn about the basic particles and properties of atoms, such as protons, neutrons, electrons, atomic number, mass number, and isotopes. Explore how atoms combine to form molecules and how molecules interact to form matter.

This web page explains the three main parts of an atom: protons, neutrons, and electrons. It also describes the nucleus, electron shells, ions, and isotopes of atoms.

This is a collection of diagrams of atoms showing the numbers of protons, neutrons, and electrons present in the atom or isotope of an element. Skip to content Menu

Learn about the basic unit of matter and its components with diagrams and examples. Discover the history and models of atom, from Thomson's plum pudding to Bohr's quantum theory.

Learn about the basic components of an atom, such as protons, neutrons and electrons, and how they form ions, isotopes and orbital. See diagrams, examples and summary of atomic structure.

Atoms are the basic particles of the chemical elements. An atom consists of a nucleus of protons and generally neutrons, surrounded by an electromagnetically bound swarm of electrons. The chemical elements are distinguished from each other by the number of protons that are in their atoms.

To understand why they are unique, you need to understand the structure of the atom (the fundamental, individual particle of an element) and the characteristics of its components. Atoms consist of electrons, protons, and neutrons.