Question

The element with atomic number 111 was first named as Unununnium. What is its IUPAC name?

• A. Nobelium
• B. Bohrium
• C. Lawrencium
• D. Roentgenium
• E. Rutherfordium

Hint:

Elements with temporary names based on systematic nomenclature are later given permanent names by IUPAC.

Answer 1

The Correct Option is D

Step 1: Elements with atomic numbers beyond 100 were initially assigned systematic names based on their digits. 
Step 2: The element with atomic number 111 was initially called Unununnium (Uuu), following the IUPAC temporary naming convention. 
Step 3: Later, IUPAC officially named element 111 as Roentgenium (Rg) in honor of Wilhelm Roentgen, the discoverer of X-rays. 
Step 4: Therefore, the correct answer is (D).