If period number and grou number of any representative element(s) are same then which of the following statement is incorrect regarding such type element(s) in their ground state? (period number and group number are according to modern form of periodic table)

Options

A. The possible value of principan quantum number is 2
B. The possible value of azimuthal quantum number is zero
C. The possible value of magnetic quantum number is 1
D. the species could be paramagnetic

Explanation

To solve the question, we need to analyze the statements regarding representative elements whose period number and group number are the same. Let's break down the solution step by step.

### Step 1: Identify Representative Elements
We need to consider representative elements from the periodic table where the period number and group number are the same. For example:
- Period 1, Group 1: Hydrogen (H)
- Period 2, Group 2: Beryllium (Be)

### Step 2: Write Electronic Configurations
Next, we write the electronic configurations for these elements:
- Hydrogen (H): 1s¹
- Beryllium (Be): 1s² 2s²

### Step 3: Analyze Each Statement
Now, we will evaluate each statement provided in the question to determine which one is incorrect.

1. **Statement 1:** The possible value of the principal quantum number is 2.
- **Analysis:** This statement is correct because the principal quantum number (n) can be 1 or 2 for elements in the first two periods.

2. **Statement 2:** The possible value of the azimuthal quantum number is zero.
- **Analysis:** This statement is also correct. The azimuthal quantum number (l) for s orbitals is 0.

3. **Statement 3:** The possible values of the magnetic quantum number is one.
- **Analysis:** This statement is incorrect. The magnetic quantum number (m) can take values from -l to +l. For l = 0 (s orbital), m can only be 0, not 1.

4. **Statement 4:** These species could be paramagnetic.
- **Analysis:** This statement is correct. Some representative elements can be paramagnetic depending on their electronic configuration.

### Conclusion
After analyzing all the statements, we find that **Statement 3** is incorrect. Therefore, the answer to the question is that the incorrect statement is regarding the magnetic quantum number.

### Final Answer
The incorrect statement is: "The possible values of the magnetic quantum number is one."

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