The correct answer is 53.
Group 17, also known as the halogens, are a group of non-metal elements with seven valence electrons. This means they readily gain one electron to achieve a stable octet configuration. The elements in this group exhibit similar chemical properties due to their identical electronic configuration in their outermost shell. Several elements belong to this group including fluorine, chlorine, bromine, iodine and astatine. Each element has a different atomic number which represents the number of protons in the atom's nucleus and uniquely identifies the element. Fluorine has an atomic number of 9, chlorine 17, bromine 35, and iodine 53. Astatine has an atomic number of 85.
Option 53, representing iodine (I), is a member of the halogen group (Group 17). Options 1 (Hydrogen), 7 (Nitrogen) and 11 (Sodium) belong to groups 1, 15 and 1 respectively.
Therefore, among the given options, only 53 corresponds to an element (Iodine) in Group 17 of the periodic table.
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