MCQ
Among the following elements, which one has the highest ionisation potential?
- ✓Hydrogen
- BLithium
- CPotassium
- DSodium
✓
Answer
Correct option: A.
Hydrogen
Ionization potential is the amount of energy required to remove an electron from an atom or a molecule in the gaseous state. Hydrogen has only one electron in its valence shell or s orbital and ionisation energy decreases from top to bottom in a group as the atomic size increases and as electron cloud goes farther away from the nucleus. So, hydrogen has the highest ionisation potential.
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