How many elements are classified as metalloids?
Quick Answer
There are usually 7 metalloids in common periodic table classifications. They include boron, silicon, germanium, arsenic, antimony, tellurium, and sometimes polonium or astatine depending on the source.
The Full Story
Most chemistry references list 7 metalloids, though the exact list can vary slightly because the border between metals and nonmetals is not perfectly sharp. The commonly named metalloids are boron, silicon, germanium, arsenic, antimony, tellurium, and sometimes polonium is debated. These elements often have properties between metals and nonmetals, which is why silicon is so important in semiconductors. Their mixed behavior makes them valuable in electronics, alloys, and materials science. The term metalloid is useful, but it is more of a classification tool than a strict natural category.
Key Facts
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"The “in-between” elements that run modern electronics"
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