MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
How many electrons are in the 'M' level of chromium?
Think it through first, then pick an option.
- a 14
- b 13
- c 12
- d 11
Answer and explanation
Correct answer: b 13
Cr is 2, 8, 13, 1 (3s² 3p⁶ 3d⁵): M holds 13.
Why the other options are wrong
- a 14: Fourteen in M is iron; Cr is 2, 8, 13, 1.
- c 12: Twelve would be 3d⁴; Cr is 3d⁵, so 13.
- d 11: 11 is vanadium's M shell; chromium's is 13.
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