Which element has highest first ionization energy?

Options

A. N
B. C
C. O
D. B

Explanation

To determine which element has the highest first ionization energy among Boron (B), Carbon (C), Nitrogen (N), and Oxygen (O), we can follow these steps:

### Step-by-Step Solution:

1. **Understand Ionization Energy**:
- Ionization energy is the energy required to remove an electron from an atom in its gaseous state. The first ionization energy refers to the energy needed to remove the outermost electron.

2. **Periodic Trends**:
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