Which element in each of the following pairs would you expect to have higher first ionisation energy and why?
N, O

Explanation

To determine which element between nitrogen (N) and oxygen (O) has a higher first ionization energy, we can follow these steps:

### Step 1: Understand Ionization Energy
Ionization energy is the energy required to remove an electron from an atom in its gaseous state. Generally, elements with a stable electronic configuration tend to have higher ionization energies because they are less likely to lose electrons.

### Step 2: Determine the Electronic Configurations
- **Nitrogen (N)** has the electronic configuration:
- 1s² 2s² 2p³
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