A) \[S\]
B) \[Se\]
C) \[O\]
D) \[Na\]
Correct Answer: D
Solution :
The elements of VI A group are known as chalcogens i.e., ore forming elements. O, S and Se belongs to VIA group. Hence they are chalcogen while \[Na\] does not belong to this group hence it is not chalcogen.
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