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
3 marksDifficulty: Medium
An element X has atomic number 12. Write its electronic configuration, its group and the formula of its chloride.
Original Khojo Papers practice question — not from a past board paper.
Answer
The configuration is 2, 8, 2; it is in group 2; and its chloride is XCl2.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Two electrons in the outermost shell put it in group 2 and give it a valency of 2, so it combines with two chlorine atoms.
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