Why is boron considered a metalloid?

As a metalloid, boron's physical and chemical properties are between those of metals and nonmetals. It behaves as a nonmetal in reaction with sodium and a metal when combined with fluorine. Other chemical elements commonly classified as metalloids include silicon, germanium, arsenic, antimony and tellurium. read more

Elemental boron is a metalloid that is found in small amounts in meteoroids but chemically uncombined boron is not otherwise found naturally on Earth. Industrially, very pure boron is produced with difficulty because of refractory contamination by carbon or other elements. read more

Boron is a non metal, but it is considered a metalloid. Metalloids are chemical elements which have properties in between those of metals and nonmetals, or that have a mixture of them. There is neither a standard definition of a metalloid nor complete agreement on the elements appropriately classified as such. read more

As a metalloid, boron's physical and chemical properties are between those of metals and nonmetals. It behaves as a nonmetal in reaction with sodium and a metal when combined with fluorine. Other chemical elements commonly classified as metalloids include silicon, germanium, arsenic, antimony and tellurium. read more