Chemistry
Ionisation potential is maximum in:
- Alkaline earth metals
- Halogens
- Inert gases
- Alkali metals
Periodic Table
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Answer
Inert gases
Reason — Ionisation potential (or ionisation energy) is the energy required to remove the outermost electron from an atom in the gaseous state. It generally increases from left to right across a period (because effective nuclear charge increases) and decreases down a group (because atomic size and shielding increase).
Noble gases have completely filled valence shells and very small atomic radii within their periods; therefore, much more energy is needed to remove an electron from them, giving them the maximum ionisation energy among the groups listed.
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