Families are classified into how many main categories according to the material?

• A. Two
• B. Three
• C. Four
• D. Five

Answer: (B)

Three broad groups organize families by their most noticeable traits: metals, nonmetals, and metalloids. Metals are typically shiny, malleable solids that conduct heat and electricity well. Nonmetals include gases and brittle solids, generally poor conductors with a wide range of properties. Metalloids sit between metals and nonmetals, often behaving like semiconductors with intermediate conductivity. This three-way split captures the essential differences used in this context, while finer classifications (like alkali metals, halogens, or noble gases) represent more specific subgroups rather than the main categories.