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Question:

The group number, number of valence electrons, and valency of an element with the atomic number 15, respectively, of P, are:

16,5and2

16,6and3

15,5and3

15,6and2

Solution:

Atomic number(Z)=15=P→[Ne]3s²3p³
Phosphorus belongs to the 15th group.
Number of valence electrons 3s²3p³=5 and valency=3 in general.
Hence, the correct option is C