The atoms of the Periodic Table of Elements II are the elementary constituents of all solid, liquid or gaseous substances; from hydrogen to oganesson, (118 atoms to date), they constitute what composes us.
 Their diameters vary between 62 pm (picometer) for Helium and 596 pm for Cesium.
 99.9% of the mass of an atom is contained in its nucleus. It is made up of protons, which carry positive electrical charges, and neutrons, which are electrically neutral. Negatively charged electrons orbit around this nucleus.
 Come closer and discover what makes you up...