Question

The IUPAC name of element with atomic number 105 is

• A. Dubnium
• B. Seaborgium
• C. Bohrium
• D. Hassium
• E. Meitnerium

Hint:

Mnemonics for elements 101-109: "Mendelevium, Nobelium, Lawrencium, Rutherfordium, Dubnium, Seaborgium, Bohrium, Hassium, Meitnerium."

Answer 1

The Correct Option is A

Step 1: Understanding the Concept:
The International Union of Pure and Applied Chemistry (IUPAC) provides official names for chemical elements. For super-heavy elements (atomic number>100), there is also a systematic naming scheme used temporarily until an official name is decided. The question asks for the official IUPAC name for the element with Z = 105.
Step 2: Detailed Explanation:
Let's analyze the options provided:

Mendelevium (Md) is the element with atomic number 101.
Nobelium (No) is the element with atomic number 102.
Lawrencium (Lr) is the element with atomic number 103.
Rutherfordium (Rf) is the element with atomic number 104.
Dubnium (Db) is the element with atomic number 105.
The systematic name for element 105 would be derived from the Latin roots for the digits: 1 (un), 0 (nil), 5 (pent), with the suffix -ium. So, the systematic name is Unnilpentium (Unp). However, the question asks for the official IUPAC name. In 1997, IUPAC officially named element 105 Dubnium (Db), in honor of the Joint Institute for Nuclear Research (JINR) in Dubna, Russia.
Step 3: Final Answer:
The official IUPAC name for the element with atomic number 105 is Dubnium. This corresponds to option (E).