MCQ practice · SSC Chemistry Board questions · Chapter 4: Periodic Table
In which group of the periodic table is nitrogen?
Think it through first, then pick an option.
- a 15
- b 9
- c 7
- d 5
Answer and explanation
Correct answer: a 15
N(7) → 2s²2p³, 2 + 3 + 10 = 15.
Why the other options are wrong
- b 9: Group 9 holds Co. The answer is 15: N(7) → 2s²2p³, 2 + 3 + 10 = 15.
- c 7: 7 is the atomic number of N, not its group. The answer is 15: 2 + 3 + 10.
- d 5: N has 5 electrons in its outer level (2s²2p³), but the group is 2 + 3 + 10 = 15.
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