The IUPAC name of an element is Unnilennium. What is the symbol of the element?
Une
Understanding IUPAC Provisional Naming for Elements
The question asks for the symbol of the element with the IUPAC provisional name Unnilennium. The International Union of Pure and Applied Chemistry (IUPAC) has a systematic way to name and symbolize newly discovered or synthesized elements, especially those with atomic numbers greater than 100, before permanent names are officially approved.
IUPAC Naming Convention Explained
The provisional naming system is based on the atomic number of the element. Each digit of the atomic number is translated into a specific root name, and these roots are then combined with an "-ium" ending for the name. The symbol is derived from the first letter of each root word corresponding to the digits.
Here are the roots for the digits:
| Digit | Root | Symbol |
|---|---|---|
| 0 | nil | n |
| 1 | un | u |
| 2 | bi | b |
| 3 | tri | t |
| 4 | quad | q |
| 5 | pent | p |
| 6 | hex | h |
| 7 | sept | s |
| 8 | oct | o |
| 9 | enn | e |
Deriving the Name and Symbol for Unnilennium
The name "Unnilennium" can be broken down into its roots:
- Un: Corresponds to the digit 1.
- nil: Corresponds to the digit 0.
- enn: Corresponds to the digit 9.
- ium: The standard ending for element names.
Putting the digits together (Un + nil + enn), we get 1 + 0 + 9, which means Unnilennium is the provisional name for the element with atomic number 109.
Now, let's derive the symbol from the first letters of the roots:
- From "Un", the first letter is U.
- From "nil", the first letter is n.
- From "enn", the first letter is e.
Combining these letters, the provisional symbol for the element Unnilennium (atomic number 109) is Une.
Comparing with the Options
We found that the symbol for Unnilennium (element 109) is Une. Let's look at the given options:
- Une
- Unl
- Unm
- Unu
The symbol we derived, Une, matches the first option.
Conclusion
Based on the IUPAC provisional naming rules, the element Unnilennium corresponds to atomic number 109. The symbol is derived from the roots "Un" (1), "nil" (0), and "enn" (9), giving us the symbol Une.
Revision Table: IUPAC Provisional Naming Key Roots
| Digit | Root Name | Root Symbol | Example Usage |
|---|---|---|---|
| 0 | nil | n | Unnil___ |
| 1 | un | u | Un___ |
| 2 | bi | b | Unbi___ |
| 3 | tri | t | Untri___ |
| 9 | enn | e | ___ennium |
Additional Information: Official Names for Elements > 100
While the IUPAC provisional naming system is used for temporary identification, elements are eventually given permanent names and symbols, often named after scientists, places, or mythological concepts. For example:
- Element 101 (Unnilunium) is now known as Mendelevium (Md).
- Element 109 (Unnilennium), the subject of this question, is now officially named Meitnerium (Mt).
- Element 118 (Ununoctium) is now officially named Oganesson (Og).
The provisional naming system is primarily for discussing elements before their permanent names are ratified.
Important Questions from Iupac Nomenclature
Choose the correct IUPAC name of the compound given below:
- IUPAC name of Metol developing agent used in photographic development solution is:
