What are metalloids characterized by in relation to their electron behavior?

Metalloids are characterized by their unique ability to exhibit properties of both metals and nonmetals, particularly in relation to their electron behavior. This duality allows them to either donate or accept electrons during chemical reactions.

For example, in some reactions, metalloids may behave like metals and donate electrons, while in other reactions, they may act like nonmetals and accept electrons. This versatility enables metalloids to participate in a wide variety of chemical interactions, which is a defining characteristic of this group of elements.

This flexibility in electron behavior is what distinguishes metalloids from purely metallic or nonmetallic substances, making them essential in many applications, such as semiconductors in electronics.