Detailed Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Problem:Passage: Inorganic chemical compounds can be broadly classified into two groups: ionic compounds and molecular compounds. The structure of all ionic compounds is an extended three-dimensional array of alternating positive and negative ions. Since ionic compounds do not take the form of individual molecules, they are represented by empirical formulas. Now we will begin to examine the formulas and nomenclature of molecular compounds. Answer: molecular compounds
Solution:
Inorganic chemical compounds can be broadly classified into two groups: ionic compounds and which other group?