A) 6
B) 8
C) 2
D) 5
Correct Answer: C
Solution :
Oxidation number of an element may be defined as the charge which an atom of the element has in its ion or appears to have when present in the combined state with other atoms. If an element exhibits an oxidation state (oxidation number) +2 then there are two electrons present in its outermost shell. It is alkaline earth metal because the oxidation number of alkaline earth metal is +2.
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