Element of atomic number 23 is placed in the periodic table in

Options

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

Answer

To determine the placement of the element with atomic number 23 in the periodic table, we can follow these steps:

### Step 1: Identify the Element
The element with atomic number 23 is Vanadium (V).

### Step 2: Determine the Electronic Configuration
To find the electronic configuration of Vanadium, we need to fill the orbitals according to the Aufbau principle. The order of filling is as follows:
1. 1s
2. 2s
3. 2p
4. 3s
5. 3p
6. 4s
7. 3d

For Vanadium (atomic number 23), the electronic configuration can be written as:
- 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d³

### Step 3: Analyze the Last Electron
In the electronic configuration, the last electron enters the 3d orbital. This indicates that Vanadium is a transition metal.

### Step 4: Classify the Element
Based on the position of the last electron in the 3d orbital, we classify Vanadium as a d-block element. The d-block elements are characterized by the presence of d orbitals being filled with electrons.

### Conclusion
Thus, the element with atomic number 23 (Vanadium) is placed in the d-block of the periodic table.

### Final Answer
The correct answer is: **d block**.

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