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If an element has the temporary IUPAC symbol 'Uuh', what is its atomic number?
From Table 3.4, 'U' stands for 'un' (1), 'u' for 'un' (1), and 'h' for 'hex' (6). Therefore, 'Uuh' corresponds to the atomic number 116. This aligns with Table 3.5 which lists Ununhexium (Uuh) for Z=116.
According to IUPAC recommendations, what suffix is always added at the end of the systematic name for elements with Z > 100?
The NCERT text states: 'The roots are put together in order of digits which make up the atomic number and “ium†is added at the end.' This confirms that '-ium' is the required suffix.
What is the systematic IUPAC name for the element with atomic number 118?
For atomic number 118, the roots are: un (1), un (1), oct (8). Adding the suffix 'ium' gives Ununoctium. This is also confirmed in Table 3.5.
The abbreviation for the numerical root 'tri' in IUPAC nomenclature for elements with Z > 100 is:
As per Table 3.4 'Notation for IUPAC nomenclature of Elements', the abbreviation for 'tri' is 't'.
Which of the following elements has the temporary IUPAC name 'Unnilpentium'?
Un (1) + nil (0) + pent (5) = 105. So, Unnilpentium corresponds to Z=105. This is verified in Table 3.5.
If the official name of an element is Rutherfordium, what was its temporary IUPAC name and atomic number?
From Table 3.5, Rutherfordium is the official name for the element with atomic number 104. Its temporary IUPAC name is Unnilquadium (un (1) + nil (0) + quad (4)).
The element with the temporary IUPAC name 'Unununnium' has the atomic number:
Un (1) + un (1) + un (1) gives the atomic number 111. So, Unununnium is for Z=111. This is consistent with Table 3.5.
Which of the following numerical roots and their abbreviations are correctly matched according to IUPAC nomenclature?
Referring to Table 3.4 'Notation for IUPAC nomenclature of Elements': Oct-o, Enn-e, and Quad-q are all correctly matched. Therefore, 'All of the above' is the correct answer.
Before official recognition, two different names were proposed by American and Soviet scientists for element 104. What were these names?
The NCERT text states: 'For example, both American and Soviet scientists claimed credit for discovering element 104. The Americans named it Rutherfordium whereas Soviets named it Kurchatovium.'
The IUPAC symbol for the element Ununquadium is:
Un (u) + un (u) + quad (q) = Uuq. This is the symbol for Ununquadium (Z=114), as listed in Table 3.5.
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