An element has maximum values of quantum numbers as
Maximum value of n = 4, Maximum value of l = 2,
Maximum value of `m= +2`,
  Maximum value of s = +1/2
(Subshells having at least one electron are considered only.) Then select the incorrect statements. 

Options

A. Element belongs to 5d series.
B. Element must belong to p-block.
C. Element must have at least 4 electrons in d-subshell.
D. Element may belong to fourth period.

Answer

To solve the question regarding the incorrect statements based on the given quantum numbers, let's break down the information step by step.

### Step 1: Understand the Quantum Numbers
The quantum numbers provided are:
- Principal quantum number (n) = 4
- Azimuthal quantum number (l) = 2
- Magnetic quantum number (m) = +2
- Spin quantum number (s) = +1/2

### Step 2: Identify the Subshell
The azimuthal quantum number (l) indicates the type of subshell:
- l = 0 corresponds to s subshell
- l = 1 corresponds to p subshell
- l = 2 corresponds to d subshell

Since l = 2, the subshell in question is a d subshell (4d).

### Step 3: Determine the Electron Configuration
In the 4d subshell:
- The magnetic quantum number (m) can take values from -l to +l, which means m can be -2, -1, 0, +1, or +2.
- Since m = +2 is given, it indicates the presence of one electron in the 4d subshell.

### Step 4: Analyze Each Statement
Now we will analyze the statements provided to find the incorrect ones.

1. **Element belongs to 5D series.**
- This is incorrect because the maximum principal quantum number is 4, which means it cannot belong to the 5D series (which would require n = 5).

2. **Element must belong to P block.**
- This is also incorrect. Elements in the d subshell (4d) are typically found in the d block, not the p block.

3. **Element must have at least 4 electrons in D subshell.**
- This is incorrect as well. We have established that there is only 1 electron in the 4d subshell.

4. **Element may belong to 4th period.**
- This statement is correct. Since the principal quantum number (n) is 4, it indicates that the element belongs to the 4th period.

### Conclusion
The incorrect statements are:
1. Element belongs to 5D series.
2. Element must belong to P block.
3. Element must have at least 4 electrons in D subshell.

### Summary of Incorrect Statements:
- Statement 1: Incorrect
- Statement 2: Incorrect
- Statement 3: Incorrect
- Statement 4: Correct