The letter J is the only letter in the alphabet that never appears on the periodic table of elements.

The periodic table was created by Dmitri Mendeleev in 1869 to organize everything that makes up our universe. Today, there are 118 officially recognized elements. Each one has a symbol made of one or two letters, like H for Hydrogen or Au for Gold. Scientists at the International Union of Pure and Applied Chemistry (IUPAC) decide these names based on history and discovery.Many symbols come from old Latin names. For example, Iron is Fe because the Latin word for it is Ferrum. Since the letter J was not part of the original Latin alphabet, it never had a chance to be used for the older elements. Even when new elements are found today, scientists stick to these traditional naming rules.In 2016, four new elements were added: Nihonium, Moscovium, Tennessine, and Oganesson. Even with these modern names, J was left out. Some languages use J for certain elements, like 'Jod' for Iodine in German or Norwegian. However, the official international symbol for Iodine is always a capital I to keep things simple for scientists everywhere.The letter Q is also very rare on the table. It only shows up in temporary names for elements that haven't been officially named yet. Once an element gets a permanent name, the Q disappears. This makes J the true loner of the alphabet when it comes to chemistry.