Same chapter3 marksDifficulty: Medium
An element has the electronic configuration 2, 8, 7. State its group, its period and whether it is a metal or a non-metal.
Periodic Properties and Variations of Properties
2 marksDifficulty: Medium
Why is the ionisation potential of magnesium greater than that of sodium?
Original Khojo Papers practice question — not from a past board paper.
Answer
Magnesium has a higher nuclear charge and a smaller atomic radius than sodium, so its outermost electrons are held more firmly and more energy is needed to remove one.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Both are in period 3, so the number of shells is the same and only the nuclear pull differs.
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