1. Tardigrade
  2. Question
  3. Chemistry
  4. Assertion: Atomic number of the element ununtrium is 113. Reason: According to IUPAC system of nomenclature, the numerical roots for 1,1 and 3 are un, un and tri respectively.

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Q. Assertion : Atomic number of the element ununtrium is 113.
Reason : According to $IUPAC$ system of nomenclature, the numerical roots for $1,1$ and $3$ are un, un and tri respectively.

Classification of Elements and Periodicity in Properties

Solution:

The atomic number of the elements above atomic number 100 were given a systematic nomenclature by IUPAC which can be derived directly from the atomic number of the element using the numerical roots for o and numbers 1-9. The names were ended with '-ium' suffix. They have three-letter abbreviation using the first letter of each number. According to IUPAC systematic nomenclature, the numerical roots for 1,1 and 3 are un, un and tri, respectively. Thus, an element with atomic number 113 has its name as Ununtrium (Uut)