MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
What is the value of n + l for 4f?
Think it through first, then pick an option.
- a 4
- b 6
- c 7
- d 8
Answer and explanation
Correct answer: c 7
4f: n = 4, l = 3, so n + l = 7.
Why the other options are wrong
- a 4: 4 is only n; add f's l = 3 to get 7.
- b 6: 6 is the value for 4d (4 + 2); for 4f it is 7.
- d 8: 8 is the value for 5f; for 4f it is 4 + 3 = 7.
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