![]() You might note in the periodic table the mass numbers are in parenthesis for elements 93 and above. At least you won’t be finding any in this lifetime. As such, elements above 92 don’t really exist, except under special laboratory conditions. All elements above atomic number 92 are created artificially in laboratories, and generally they are extremely unstable and tend to disintegrate rapidly. As such, it’s highly unstable and unable to exist for very long. It is element 94, making it bigger than uranium. In 1940, a new element, plutonium, was created in a laboratory. Element 92 is uranium, the biggest element that occurs naturally on Earth. Before the year 1940, it was believed that only 92 elements existed. (See the original work of Dmitri Mendeleev here.) At that time, scientists were still discovering new elements almost every year. ![]() The original table of the elements, credited to Dmitri Mendeleev in 1871, had only 56 elements. 1995 - 2024.The table of elements shown here has 108 elements. ![]() Periodic Table of Elements - Sorted by Atomic Mass Average. ![]() If you need to cite this page, you can copy this text: ![]()
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