Final answer:
Metalloids have properties of both metals and non-metals. They differ in terms of reactivity and placement on the periodic table.
Step-by-step explanation:
One similarity between metalloids is that they have properties of both metals and non-metals. This means that they can conduct electricity to some extent, but not as well as metals. They also have intermediate characteristics when it comes to their appearance, malleability, and conductivity.
One difference between metalloids is their reactivity. Some metalloids, like silicon, are relatively unreactive and stable, while others, like boron, are highly reactive. Another difference is their placement on the periodic table. Metalloids are found along the zigzag line that separates metals from non-metals.
Learn more about Properties and characteristics of metalloids