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Metalloids usually look like metals but behave largely like nonmetals.Physically, they are shiny, brittle solids with intermediate to relatively good electrical conductivity and the electronic band structure of a semimetal or semiconductor.A metalloid is any chemical element which has properties in between those of metals and nonmetals, or that has a mixture of them.

This exception arises due to competing horizontal and vertical trends in the nuclear charge.

Going along a period, the nuclear charge increases with atomic number as do the number of electrons.

Despite the lack of specificity, the term remains in use in the literature of chemistry.

The six commonly recognised metalloids are boron, silicon, germanium, arsenic, antimony, and tellurium.

Depictions of metalloids vary according to the author.

Some do not classify elements bordering the metal–nonmetal dividing line as metalloids, noting that a binary classification can facilitate the establishment of rules for determining bond types between metals and nonmetals.

The properties of form, appearance, and behaviour when mixed with metals are more like metals.

Elasticity and general chemical behaviour are more like nonmetals.

The electrical properties of silicon and germanium enabled the establishment of the semiconductor industry in the 1950s and the development of solid-state electronics from the early 1960s.

The term metalloid originally referred to nonmetals.

Typical metalloids have a metallic appearance, but they are brittle and only fair conductors of electricity. Metalloids are usually too brittle to have any structural uses.

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