The Periodic Table
The chart arranging all chemical elements by atomic number into rows and columns that reveal the patterns in their properties.
Origin
Dmitri Mendeleev published the first widely accepted version in 1869, arranging the known elements by atomic weight and leaving gaps for predicted-but-undiscovered ones — gallium, germanium, scandium all turned up later, matching his predictions. The modern version is organized by atomic number (the number of protons). 118 elements have been confirmed; new ones (oganesson, tennessine) have been synthesized only as a few atoms in particle accelerators.
Modern usage
Visual shorthand for 'systematic, complete, organized.' Endless 'periodic table of [X]' parodies — cocktails, Trump cabinet members, programming languages, swearwords. The black-and-white classroom chart is one of the most-recognized scientific images on Earth. Element nerds know their symbols (Pb for lead, Au for gold) as a flex.
Tags