What is the group no of element Une ?

Answer

To determine the group number of the element with the symbol U, N, E, we can follow these steps:

### Step 1: Identify the Atomic Number
The symbols U, N, and E correspond to specific numbers based on their notation:
- U = 1
- N = 0
- E = 9

Thus, the atomic number of the element is calculated as:
\[ \text{Atomic Number} = 100 + U + N + E = 100 + 1 + 0 + 9 = 109 \]

### Step 2: Determine the Electronic Configuration
Next, we need to find the electronic configuration for the element with atomic number 109.
- The electronic configuration starts from the nearest noble gas, which is Radon (Rn) with atomic number 86.
- The configuration can be written as:
\[ \text{Rn} (86) \rightarrow 5f^{14} \, 6d^{7} \, 7s^{2} \]

### Step 3: Identify the Block of the Element
Since the last electron is entering the d sub-shell (6d), this element is classified as a d-block element.

### Step 4: Calculate the Group Number
For d-block elements, the group number can be determined by the formula:
\[ \text{Group Number} = (\text{number of electrons in } (n-1)d) + (\text{number of electrons in } ns) \]

From the electronic configuration:
- The number of electrons in the (n-1)d shell (6d) = 7
- The number of electrons in the valence s shell (7s) = 2

Thus, the group number is:
\[ \text{Group Number} = 7 + 2 = 9 \]

### Final Answer
The group number of the element with the symbol U, N, E is **9**.

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