Untritrium

Untritrium is a nonstandard spelling of ununtrium, the former temporary systematic name for element 113, now named nihonium.

Nihonium: Nihonium is the chemical element with atomic number 113 and symbol Nh. This is the element untritrium was intended to name.
Systematic element name: A systematic element name encodes an element's atomic number using standardized numerical roots and a name-ending suffix. Ununtrium was generated by this naming system from element 113's atomic number.
Ununpentium: Ununpentium was the temporary systematic name for element 115, now called moscovium. Its similar provisional form names a different element.
Element 113 discovery: The discovery of element 113 was the experimental synthesis and identification of atoms with 113 protons. The discovery's recognition made a permanent name possible.
Ununtrium: Ununtrium was the temporary systematic name assigned to element 113 before it was named nihonium. This is the standard spelling behind the nonstandard form untritrium.
Element 113: Element 113 is the chemical element now named nihonium, with atomic number 113. The temporary name ununtrium encoded this element's atomic number.
Ununseptium: Ununseptium was the temporary systematic name for element 117, now called tennessine. The shared numerical naming pattern can obscure that it denotes another element.
Riken: RIKEN is a Japanese national research institute that conducts research across the natural sciences. A RIKEN team synthesized element 113 and proposed the name nihonium.
IUPAC: The International Union of Pure and Applied Chemistry is the organization that standardizes chemical nomenclature and terminology. IUPAC assigned element 113 its temporary name and later approved nihonium.
Atomic number: The atomic number is the number of protons in an atom's nucleus and identifies its chemical element. Its value of 113 supplied the numerical roots in ununtrium.

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UntriseptiumCompared with: Its replacement illustrates how a temporary name gives way after an element is confirmed.