Which groups of the modern periodic table contain elements that are classified as metalloids?

• A. Groups 3–12
• B. Groups 1–2
• C. Groups 13–17
• D. Groups 18 only

Answer: (C)

Verified step by step guidance

1. Understand that metalloids are elements with properties intermediate between metals and nonmetals, often found along the 'stair-step' line on the periodic table.
2. Recall the layout of the modern periodic table, which is divided into groups numbered 1 through 18 from left to right.
3. Identify that metalloids are typically located in groups 13 through 17, where elements show a gradual transition from metallic to nonmetallic character.
4. Note that groups 3–12 contain transition metals, groups 1–2 contain alkali and alkaline earth metals, and group 18 contains noble gases, none of which are classified as metalloids.
5. Conclude that the groups containing metalloids are groups 13–17, as these include elements like boron, silicon, arsenic, and tellurium.