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Currently, there are 117 total discovered elementsnumbering from 1 to 118. The missing number is 117, as Ununseptium has not yet been discovered, and no attempt to synthesize this element has been reported. The highest number therefore is 118, Ununoctium, and it is currently the only synthetic member of group 18 and has the highest atomic number and highest Atomic Mass assigned to a discovered element. The radioactive ununoctium (118) atom is very unstable, and since 2002, only three atoms of the isotope 294Uuo have ever been detected.

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16y ago

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