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 properties of representative elements where the period number and group number are the same. This situation occurs specifically for hydrogen (H) in period 1, group 1, and beryllium (Be) in period 2, group 2.

### Step-by-Step Solution:

1. **Identify the Elements**:
- The only representative elements where the period number and group number are the same are hydrogen (H) and beryllium (Be).
- Hydrogen is in period 1, group 1.
- Beryllium is in period 2, group 2.

2. **Write the Electron Configurations**:
- Hydrogen (H): Atomic number = 1 → Electron configuration = 1s¹
- Beryllium (Be): Atomic number = 4 → Electron configuration = 1s² 2s²

3. **Determine Principal Quantum Number (n)**:
- For hydrogen (H), the principal quantum number (n) = 1.
- For beryllium (Be), the principal quantum number (n) = 2.

4. **Determine Azimuthal Quantum Number (l)**:
- The azimuthal quantum number (l) for s orbitals is 0.
- For hydrogen, the only electron is in the 1s orbital, so l = 0.
- For beryllium, the 2s orbital also has l = 0.

5. **Determine Magnetic Quantum Number (m_l)**:
- The magnetic quantum number (m_l) for s orbitals can only be 0.
- Therefore, for both hydrogen and beryllium, m_l = 0.

6. **Evaluate the Statements**:
- The question asks which statement is incorrect regarding these elements in their ground state.
- Since both hydrogen and beryllium have only s electrons in their ground state, the magnetic quantum number for both will be 0.
- Any statement suggesting that the magnetic quantum number can be anything other than 0 for these elements would be incorrect.

7. **Conclusion**:
- The incorrect statement regarding such elements in their ground state is that the magnetic quantum number can take values other than 0.

### Final Answer:
The incorrect statement regarding such type of element(s) in their ground state is that the magnetic quantum number can be anything other than 0.

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