MCQ practice · SSC Chemistry Board questions · Chapter 4: Periodic Table
An element has the configuration 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁶4d¹⁰5s². Which group is it in?
Think it through first, then pick an option.
- a 02
- b 04
- c 12
- d 14
Answer and explanation
Correct answer: c 12
Rule 3: 4d¹⁰ with 5s² gives 10 + 2 = 12.
Why the other options are wrong
- a 02: Counting only 5s² gives 2 and leaves out 4d¹⁰. The answer is 12.
- b 04: Group 4 would need d². The answer is 12.
- d 14: Group 14 needs s and p outside. The answer is 12.
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