The group that includes iodine, bromine, chlorine, and contains Tennessine and Astatine belongs to which category of elements?

The group that includes iodine, bromine, chlorine, and contains Tennessine and Astatine belongs to which category of elements?

• A. Halogen
• B. Noble gas
• C. Alkali metal
• D. Alkaline earth metal

Answer: (A)

Recognizing a family on the periodic table is being tested. The elements chlorine, bromine, and iodine are classic members of the halogen family. Halogens are nonmetals with seven valence electrons, so they readily gain one electron to complete their outer shell, making them highly reactive. Tennessine and astatine are also part of this family, extending the group into heavier, rarer elements. The other options describe different kinds of elements: noble gases are very unreactive, alkali metals are reactive metals, and alkaline earth metals are reactive metals in a different column. So the best category is halogen.

Recognizing a family on the periodic table is being tested. The elements chlorine, bromine, and iodine are classic members of the halogen family. Halogens are nonmetals with seven valence electrons, so they readily gain one electron to complete their outer shell, making them highly reactive. Tennessine and astatine are also part of this family, extending the group into heavier, rarer elements. The other options describe different kinds of elements: noble gases are very unreactive, alkali metals are reactive metals, and alkaline earth metals are reactive metals in a different column. So the best category is halogen.