The questions given below contain statement -1 (Assertion ) and statement -2 (Reason ) . It has four options (a), (b) , ( c) and (d ) out of which ONLY ONE is correct . Choose the correct option as.
Statement - 1 . The elements having `1 s^(2) 2s^(2) 2p^(6) 3s^(2)` and ` 1s^(2) 2s^(2)` configuration belong to the same group
Statement -2 . Both have same number of electrons electrons in the valence shell.

Options

A. Statement -1 is True Statement -2 is True , Statement -2 is correct explanation for Statement -2
B. Statement -1 is True Statement -2 is True , Statement -2 is not a correct explanation for Statement -2
C. Statement -1 is True Statement -2 is False
D. Statement -1 is False Statement -2 is True

Explanation

To solve the given question, we need to analyze both statements and determine their validity.

### Step 1: Analyze Statement 1
- **Statement 1**: "The elements having `1s^(2) 2s^(2) 2p^(6) 3s^(2)` and `1s^(2) 2s^(2)` configuration belong to the same group."
- The electronic configuration `1s^(2) 2s^(2) 2p^(6) 3s^(2)` corresponds to Magnesium (Mg), which is in Group 2 of the periodic table.
- The electronic configuration `1s^(2) 2s^(2)` corresponds to Beryllium (Be), which is also in Group 2 of the periodic table.
- **Conclusion**: Statement 1 is **True**.

### Step 2: Analyze Statement 2
- **Statement 2**: "Both have the same number of electrons in the valence shell."
- For Magnesium (Mg), the valence shell is the 3rd shell (n=3), and it has 2 valence electrons (3s²).
- For Beryllium (Be), the valence shell is the 2nd shell (n=2), and it has 2 valence electrons (2s²).
- **Conclusion**: Statement 2 is also **True**.

### Step 3: Determine the Relationship Between the Statements
- Since both statements are true, and Statement 2 correctly explains Statement 1 (both elements have the same number of valence electrons and belong to the same group), we can conclude that the correct option is that both statements are true, and Statement 2 is the reason for Statement 1.

### Final Answer
The correct option is (a) - both statements are true, and Statement 2 is the reason for Statement 1.

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