Assertion (A) : Ionisation potential of Be (atomic number `4` ) is more than B (atomic number `5)`
Reason (R ) : The first electron released fromm Be is of p orbitals but that from B is of s orbitals.

Options

A. If both (A) and (R ) correct and (R ) is the correct explanation for (A)
B. If both (A) and (R ) correct and (R ) is the correct explanation for (A)
C. If (A) is correct but (R ) is incorrect
D. If both (A) and (R ) are incorrect

Explanation

To solve the question, we will analyze the assertion and reason provided, and verify their correctness step by step.

### Step 1: Understand the Assertion
The assertion states that the ionization potential of Beryllium (Be) is more than that of Boron (B).

**Explanation**:
- Beryllium has an atomic number of 4, and its electronic configuration is \(1s^2 2s^2\).
- Boron has an atomic number of 5, and its electronic configuration is \(1s^2 2s^2 2p^1\).
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