Final answer:
The Lewis symbols for the ions in the given ionic compounds are as follows: Sr2+[O]2-, 2Li+[S]2-, Ca2+[I]-, and Rb+[F]-.
Step-by-step explanation:
The Lewis symbol, also known as electron dot notation, can be used to represent ions in ionic compounds. In this notation, the chemical symbol of the element is surrounded by dots representing its valence electrons. Here are the Lewis symbols for the ions in each of the given ionic compounds:
a. SrO: Sr2+[O]2-
b. Li2S: 2Li+[S]2-
c. CaI2: Ca2+[I]-
d. RbF: Rb+[F]-
Each Lewis symbol consists of the symbol of the element followed by the appropriate charge (if it is an ion) and the valence electrons represented as dots around the symbol. The number of dots is equal to the number of valence electrons for that element.