Final answer:
Lithium is the element from the given list that belongs to a named group in the periodic table; it is part of the alkali metals in Group 1. Other elements listed do not fit the characteristics of a single named group.
Step-by-step explanation:
Understanding Group Characteristics in The Periodic Table
The periodic table organizes elements into groups and periods, with elements in the same group having similar chemical properties. For instance, alkali metals belong to Group 1 and include elements such as sodium and lithium. The alkaline earth metals make up Group 2, with elements like magnesium and calcium. Group 17 consists of the halogens, including fluorine and chlorine, while Group 18 contains the noble gases, such as helium and argon.
When considering the given characteristics and the listed elements, the element that fits into a named group is lithium, which is an alkali metal. Other elements listed, such as aluminum and silicon, belong to other groups that have different chemical properties. Strontium is an alkaline earth metal, thus part of Group 2 and not the group described in the question.