A) F
B) Cl
C) Br
D) I
Correct Answer: D
Solution :
Halogens are non-metallic because of very high ionisation energy. The non-metallic character decreases down the group, therefore iodine shows some metallic character and forms positive ions such as \[{{\text{I}}^{\text{+}}}\] and \[{{\text{I}}^{3+}}.\]
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