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The "official index of elements" IS the Periodic Table of the Elements, which organizes all 118 known chemical elements by increasing atomic number. The international authority responsible for maintaining and updating the table, as well as naming new elements, is the International Union of Pure and Applied Chemistry (IUPAC).
The periodic table is a fundamental tool in chemistry and physics, providing a structured overview of the elements' properties and allowing scientists to discern trends and predict chemical behavior.
Columbus wasn't the first person to discover America in 1492. The indigenous people were already there. He wasn't even the first European. That title goes to Leif Ericsson.
13 / 15. However, surely the elements are organised in the periodic table! So really 14/15! Can’t remember the other one I got wrong. So possibly 15/15!