Which of the following is not correctly matched

Options

A. d-block element: `(n-1)d^(1-10)ns^(0-2)`
B. p-block element:`ns^(2)np^(1-6)`
C. s-block element: `(n-1)f^(@)(n-1)d^(@)ns^(1-2)`
D. Representative element : `ns^(1-2)np^(1-5)`

Answer

To determine which of the following options is not correctly matched, we will analyze each option step by step.

### Step 1: Analyze D Block Elements
- **Definition**: D block elements are characterized by the filling of d orbitals.
- **Configuration**: The general electronic configuration for d block elements is given as \( (n-1)d^{1-10} ns^{0-2} \).
- **Conclusion**: The first option is correctly matched.

### Step 2: Analyze P Block Elements
- **Definition**: P block elements have their last electron entering a p orbital.
- **Configuration**: The general electronic configuration for p block elements is \( ns^{2} np^{1-6} \).
- **Conclusion**: The second option is correctly matched.

### Step 3: Analyze S Block Elements
- **Definition**: S block elements have their last electron entering an s orbital.
- **Configuration**: The general electronic configuration for s block elements is \( ns^{1-2} \) with \( (n-1)d^{0} \) and \( n-2f^{0} \) being irrelevant.
- **Conclusion**: The third option is correctly matched.

### Step 4: Analyze Representative Elements
- **Definition**: Representative elements (or main group elements) include groups 1, 2, and 13 to 18.
- **Configuration**: Their general electronic configuration is \( ns^{1-2} \) or \( np^{1-6} \).
- **Conclusion**: The fourth option states \( ns^{1-2} \) or \( np^{1-5} \), which is incorrect because the p block can have up to 6 electrons.

### Final Conclusion
- The option that is not correctly matched is **Option D**.