A) \[F,\,\,Cl,\,\,Br\]
B) \[Li,\,\,Na,\,\,K\]
C) \[O,\,\,S,\,\,Se\]
D) \[N,\,\,P,\,\,As\]
Correct Answer: B
Solution :
Li, Na and K are alkali metals with low ionization energy and one electron in their outermost shell so they will form cation easily.
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