Question

Consider the above figure as Periodic Table. Then the element with a possible oxidation number of $-2$ is:

• A. A
• B. B
• C. C
• D. D
• E. E

Answer 1

The correct option is C C

The group to which element $C$ belongs is $16$ group $6$ valence electrons. Group $16$ elements can accept two electrons to complete their octet with oxidation number $-2$.