This 2D companion to the 3D periodic table lays out all 118 known elements on a flat, clickable grid exactly like the wall-chart version: click any tile to read its atomic number, atomic mass, electron configuration and element family in the side panel, filter the whole table down to just one family (alkali metals, halogens, noble gases and more) with the category chips, or jump straight to an element by typing its name or symbol into the search box.