Final answer:
Group 13 elements, including boron, aluminum, gallium, indium, and thallium, are likely to have substances with both metallic and nonmetallic properties.
Step-by-step explanation:
Elements that have both metallic and nonmetallic properties are called metalloids, or semimetals. They are located on the periodic table between metals and nonmetals. One group of elements that are likely to have substances with both metallic and nonmetallic properties is Group 13, which includes the metalloid boron and the metals aluminum, gallium, indium, and thallium.