Noble gases possess .... .. ...... values of ionisation energies due to the presence of ............ .

Explanation

**Step-by-Step Solution:**

1. **Understanding Noble Gases**: Noble gases belong to Group 18 of the periodic table. They include elements like Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn).

2. **Defining Ionization Energy**: Ionization energy is defined as the amount of energy required to remove an electron from an isolated gaseous atom in its ground state.

3. **Analyzing Noble Gases' Electron Configuration**:
- Helium (He) has the electronic configuration of 1s².
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