Among the following, which elements are classified as halogens?

Halogens are a group of elements found in Group 17 of the periodic table and are known for their high reactivity, particularly with alkali metals and alkaline earth metals. The elements classified as halogens include fluorine, chlorine, bromine, iodine, and astatine.

In the context of the choices provided, the selection that includes bromine, iodine, and astatine is indeed correct, as all three are recognized as halogens. Bromine is a liquid at room temperature and is known for its reddish-brown color, iodine exists as a solid with a purple vapor, and astatine, while less commonly encountered due to its radioactivity, is included in the group of halogens.

The other options listed include elements that do not belong to the halogen group, such as noble gases and alkali metals or alkaline earth metals, which are not reactive in the same manner as halogens. Thus, the classification of the elements in the correct choice aligns perfectly with the defining properties of halogens.