The IUPAC name of an element with atomic number 119 is
1 ununoctium
2 ununennium
3 unnilennium
4 unununnium
The correct answer and explanation is :
The correct IUPAC name for an element with atomic number 119 is ununennium. Therefore, the correct option is:
2) ununennium
Explanation:
The IUPAC (International Union of Pure and Applied Chemistry) naming system is used to create systematic names for elements that have not yet been discovered or confirmed. The naming follows a convention based on the atomic number of the element.
Each name is constructed using Latin or Greek roots that correspond to the digits of the atomic number. These are combined in a specific order:
- “Un” for “one” (1),
- “Nov” for “nine” (9),
- “Ennium” as the suffix for elements in the seventh period (for elements in periods 7 and beyond).
So, for an element with atomic number 119, the name would be constructed as follows:
- “Un” for 1,
- “Un” for 1 (again for the next digit),
- “Ennium” as the suffix for the element.
Hence, ununennium is the IUPAC name for the element with atomic number 119.
Why the other options are incorrect:
- 1. Ununoctium (118): This is the IUPAC name for the element with atomic number 118, which is oganesson.
- 3. Unnilennium: This would correspond to atomic number 115, so it is not the correct name for 119.
- 4. Unununnium: This name was previously used for an element with atomic number 111, which is now named roentgenium.
Thus, the systematic naming convention follows a clear logic based on the atomic number, and ununennium is the appropriate IUPAC name for the element with atomic number 119.