The periodic table, also called the periodic table of elements, is an organized arrangement of the 118 known chemical elements. The chemical elements are arranged from left to right and top to bottom ...

What makes oxygen oxygen and not, say, iron is not what these two elements are made of—both kinds of atoms have nuclei made of protons and neutrons, with a surrounding cloud of electrons. It’s how ...

The strongest force in the Universe is the one that holds together the protons and neutrons in an atom’s nucleus. To unlock how elements are forged, the physics of neutron stars and more, scientists ...