The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic ...

For example, Lead is a chemical element with the symbol Pb (from the Latin for lead, plumbum).W stands for tungsten (from the word wolfram) and Na stands for sodium (from the word natrium).

That pun is based on the fact that the main building blocks in the branch of science are chemical elements, pure substances ...