For which element the second ionization enthalpy is expected to be greater, N or O ?

Explanation

To determine which element, nitrogen (N) or oxygen (O), has a greater second ionization enthalpy, we can follow these steps:

### Step 1: Understand Ionization Enthalpy
Ionization enthalpy is the energy required to remove an electron from an atom in the gaseous state. The second ionization enthalpy refers to the energy needed to remove a second electron after the first has already been removed.

### Step 2: Write the Electronic Configurations
- **Nitrogen (N)**: Atomic number = 7
- Electronic configuration: \(1s^2 2s^2 2p^3\)
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