MCQ
Number of elements from the following that CANNOT form compounds with valencies which match with their respective group valencies is __________.
B, C, N, S, O, F, P, Al, Si
B, C, N, S, O, F, P, Al, Si
- A7
- B5
- C6
- D3
✓
Answer
N,O, F can't extend their valencies upto their group number due to the non-availability of vacant 2d like orbital.
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