Question:
The IUPAC nomenclature of the element with atomic number 105 is unnilpentium. What is its official IUPAC name?
The IUPAC nomenclature of the element with atomic number 105 is unnilpentium. What is its official IUPAC name?
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Atomic numbers 104 (Rf) and 105 (Db) are often tested together. Memorize the names of elements 101-118, as they frequently appear in inorganic chemistry questions.
Updated On: Jun 26, 2026
- Lawrencium
- Nobelium
- Seaborgium
- Meitnerium
- Dubnium
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The Correct Option is
Solution and Explanation
Step 1: Understanding the Concept:
IUPAC uses systematic names for elements with $Z > 100$ based on their digits until a permanent official name is assigned.
Step 2: Detailed Explanation:
The sequence of official names for elements after Fermium ($Z=100$) is:
- 101: Mendelevium (Md)
- 102: Nobelium (No)
- 103: Lawrencium (Lr)
- 104: Rutherfordium (Rf)
- 105: Dubnium (Db)
- 106: Seaborgium (Sg)
- 109: Meitnerium (Mt)
Thus, unnilpentium (105) is officially named Dubnium.
Step 3: Final Answer:
The official name is Dubnium.
IUPAC uses systematic names for elements with $Z > 100$ based on their digits until a permanent official name is assigned.
Step 2: Detailed Explanation:
The sequence of official names for elements after Fermium ($Z=100$) is:
- 101: Mendelevium (Md)
- 102: Nobelium (No)
- 103: Lawrencium (Lr)
- 104: Rutherfordium (Rf)
- 105: Dubnium (Db)
- 106: Seaborgium (Sg)
- 109: Meitnerium (Mt)
Thus, unnilpentium (105) is officially named Dubnium.
Step 3: Final Answer:
The official name is Dubnium.
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