Chemistry MCQs for NEET — Practice Questions with Answers

As per Table 3.4 and 3.5 in the NCERT text, the numerical roots for the digits 1, 0, and 4 are 'un', 'nil', and 'quad' respectively. Combining these in order of the atomic number digits (1-0-4) gives 'Unnilquad', and adding 'ium' at the end makes it Unnilquadium.

According to Table 3.5 of the NCERT text, the IUPAC symbol for Unnilennium (atomic number 109) is 'Une'. The symbols are derived from the first letter of each root: un (U), nil (n), enn (e).

Table 3.5 lists Mendelevium as the official name with atomic number 101, and its IUPAC temporary name is Unnilunium. The component roots are 'un' for 1, 'nil' for 0, and 'un' for 1.

According to Table 3.5, the element with atomic number 110 has the temporary IUPAC name Ununnillium and the official IUPAC name Darmstadtium.

From Table 3.4, 'sept' corresponds to the digit 7. Looking at the options and Table 3.5, Ununseptium has an atomic number of 117, where the last digit '7' is represented by 'sept'.

Table 3.5 shows that the official IUPAC name for element 118 (Ununoctium) is Oganesson, named after Yuri Oganessian.

For Ununquadium, the digits are 1, 1, 4. The roots are 'un', 'un', 'quad'. The IUPAC symbol is formed by taking the first letter of each root, so 'Uuq' (from Table 3.5).

The NCERT text states: 'To avoid such problems, the IUPAC has made recommendation that until a new element’s discovery is proved, and its name is officially recognised, a systematic nomenclature be derived directly from the atomic number of the element... For example, both American and Soviet scientists claimed credit for discovering element 104...'

Atomic number 115 breaks down into 1 (un), 1 (un), 5 (pent). Combining these roots and adding 'ium' gives Ununpentium (Table 3.5).

Table 3.4 clearly states that for the digit 9, the name is 'enn' and the abbreviation is 'e'.