From amongst Be, B and C, Choose the element with highest and lowest first ionization enthalpy.

Explanation

To determine the element with the highest and lowest first ionization enthalpy among beryllium (Be), boron (B), and carbon (C), we can follow these steps:

### Step-by-Step Solution:

1. **Understand Ionization Enthalpy**: Ionization enthalpy is the energy required to remove an electron from an isolated gaseous atom. The first ionization enthalpy specifically refers to the energy needed to remove the first electron.

2. **Identify Electronic Configurations**:
- Beryllium (Be): 1s² 2s²
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