Which statement concerning the elements fluorine,chlorine,bromine,and iodine is INCORRECT?

Question

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Fluorine, chlorine, bromine, and iodine are all halogens (Group 17 elements) and nonmetals, and they all have seven valence electrons. However, they do not have the same valence shell; as you move down the group from fluorine to iodine, each element has its valence electrons in a shell one level higher than the element above it.

Which Statement Concerning the Elements Fluorine,chlorine,bromine,and Iodine Is INCORRECT