Unhexseptium

Unhexseptium is the temporary systematic name assigned to hypothetical element 167 under IUPAC’s numerical naming rules. No element with atomic number 167 has been confirmed.

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Atomic number: The number of protons in an atom’s nucleus, which identifies its chemical element. The value 167 defines which hypothetical element Unhexseptium names.
Systematic element name: A provisional element name formed by combining numerical roots for its atomic number’s digits with a standard ending. Unhexseptium follows this construction for the digits of 167.
Official IUPAC element name: The approved permanent name assigned by IUPAC to a recognized chemical element. Unhexseptium is systematic and provisional, not an approved permanent element name.
Island of stability: A predicted region of superheavy nuclei with comparatively long half-lives due to nuclear shell effects. Its predictions motivate interest in whether nuclei near element 167 could persist long enough to detect.
Chemical element: A pure substance defined by atoms with the same number of protons. Unhexseptium would be the name of an element if atomic number 167 were confirmed.
Element 167: The hypothetical chemical element whose atoms would contain 167 protons. It is the specific atomic-number target represented by Unhexseptium.
Ununhexium: A former temporary systematic name for element 116, now officially named livermorium. Its replacement shows how temporary digit-based names give way to approved names.
Superheavy element: A chemical element with a very high atomic number, generally produced only through nuclear reactions. Element 167 would lie beyond all elements currently confirmed.
IUPAC: The international organization that develops standards for chemical nomenclature and terminology. IUPAC established the systematic rules behind Unhexseptium’s temporary name.
IUPAC numerical roots: The syllables used in IUPAC’s systematic naming scheme to encode digits in an element’s atomic number. The roots for one, six, and seven combine to form Unhexseptium.