Question

The IUPAC name of an element with atomic number \( 119 \) is:

• A. Ununennium
• B. Unnilennium
• C. Unununium
• D. ununoctium

Hint:

To remember the rules: if a root ends in 'n' (like enn) and the suffix is 'ium', you keep both 'n's. However, if a root ends in 'i' (like bi or tri) and is followed by 'ium', you drop one 'i' (e.g., Ununtrium, not Ununtriiium).

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
IUPAC established a systematic nomenclature for elements with atomic number $Z>100$ based on numerical roots for each digit.
Step 2: Detailed Explanation:
The numerical roots are:
0 = nil, 1 = un, 2 = bi, 3 = tri, 4 = quad, 5 = pent, 6 = hex, 7 = sept, 8 = oct, 9 = enn.
The final name is formed by joining the roots and adding the suffix "-ium".
For atomic number 119:
Digit 1: un
Digit 1: un
Digit 9: enn
Suffix: ium
Combining them: un + un + enn + ium = Ununennium.
The symbol would be Uue.
Step 3: Final Answer:
The name is Ununennium.