Question
Chemistry Question on Classification of elements & periodicity in properties
Which one of the following is not a Chalcogen?
A
S
B
Se
C
O
D
Na
Answer
Na
Explanation
Solution
The elements of VI A group are known as chalcogens i.e., ore forming elements. O, S and Se belongs to VI A group. Hence they are chalcogen while Na does not belong to this group hence it is not chalcogen.