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Five elements are less frequently so classified: carbon, aluminium, selenium, polonium, and astatine.

On a standard periodic table, all eleven are in a diagonal area in the p-block extending from boron at the upper left to astatine at lower right, along the dividing line between metals and nonmetals shown on some periodic tables. Most of their other physical and chemical properties are intermediate in nature.

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.

Periodic table extract showing groups 1–2 and 12–18, and a dividing line between metals and nonmetals.

Percentages are median appearance frequencies in the list of metalloid lists.

The above table reflects the hybrid nature of metalloids.

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.

Its more recent meaning, as a category of elements with intermediate or hybrid properties, became widespread in 1940–1960.

Metalloids are sometimes called semimetals, a practice that has been discouraged, A metalloid is an element with properties in between, or that are a mixture of, those of metals and nonmetals, and which is therefore hard to classify as either a metal or a nonmetal.

A metalloid is any chemical element which has properties in between those of metals and nonmetals, or that has a mixture of them.

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