How many transuranium elements have been discovered and named or await confirmation?

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A color-coded periodic table of the elements displays each element's symbol and atomic number, with categories such as alkali metals, noble gases, halogens, transition metals, and actinoid elements distinguished by different background colors. — transuranium element Modern version of the periodic table of the elements (printable).

There are 26 transuranium elements that have been discovered and named or are currently awaiting confirmation of their discovery.1

These elements are defined as those with atomic numbers greater than 92, which is the atomic number of uranium. Within this group, elements from neptunium through lawrencium (atomic numbers 93–103) are classified as part of the actinoid series, while those with atomic numbers higher than 103 are known as transactinoids.1