An element having electronic configuration `1s^2 2s^2 2p^6 3s^2 3p^6 3d^(10) 4s^1` is related to which block in the periodic table:

Options

A. s–block
B. p–block
C. d–block
D. f–block

Answer

To determine which block in the periodic table the element with the electronic configuration `1s^2 2s^2 2p^6 3s^2 3p^6 3d^(10) 4s^1` belongs to, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Electronic Configuration**: The given electronic configuration is `1s^2 2s^2 2p^6 3s^2 3p^6 3d^(10) 4s^1`.

2. **Count the Total Electrons**:
- The total number of electrons can be calculated by adding the superscripts:
- 1s: 2
- 2s: 2
- 2p: 6
- 3s: 2
- 3p: 6
- 3d: 10
- 4s: 1
- Total = 2 + 2 + 6 + 2 + 6 + 10 + 1 = 29

3. **Determine the Atomic Number**: The total number of electrons in a neutral atom is equal to its atomic number. Therefore, the atomic number of this element is 29.

4. **Identify the Element**: The element with atomic number 29 is Copper (Cu).

5. **Determine the Block**:
- In the periodic table, elements are categorized into blocks based on their electron configurations:
- s-block: Groups 1 and 2
- p-block: Groups 13 to 18
- d-block: Transition metals (Groups 3 to 12)
- f-block: Lanthanides and Actinides
- Since the last electron enters the 3d subshell (3d^10), this element belongs to the d-block.

6. **Conclusion**: Therefore, the element with the electronic configuration `1s^2 2s^2 2p^6 3s^2 3p^6 3d^(10) 4s^1` is a transition metal and belongs to the d-block of the periodic table.

### Final Answer:
The element with the electronic configuration `1s^2 2s^2 2p^6 3s^2 3p^6 3d^(10) 4s^1` is related to the **d-block** in the periodic table.

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