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
1 markDifficulty: Medium
An element with the electronic configuration 2, 8, 1 belongs to:
- agroup 1, period 3
- bgroup 3, period 1
- cgroup 11, period 3
- dgroup 1, period 2
Original Khojo Papers practice question — not from a past board paper.
Answer
group 1, period 3
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Three shells give period 3 and one valence electron gives group 1; the element is sodium.
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