Same chapter1 markDifficulty: Easy
Across a period from left to right, the atomic size:
Periodic Properties and Variations of Properties
2 marksDifficulty: Easy
State two reasons why ionisation energy increases on moving across a period from left to right.
Original Khojo Papers practice question — not from a past board paper.
Answer
The nuclear charge increases across a period, so the outermost electron is held more firmly, and the atomic size decreases, so the outermost electron is closer to the nucleus. Both make the removal of an electron harder.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Ionisation energy is the energy needed to remove the most loosely held electron from a neutral gaseous atom.
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