Question

Which among the following elements is metalloid?
A.Beryllium
B.Barium
C.Boron
D.Bismuth

Answer 1

Hint: Metalloids are the elements that have both metallic and non-metallic properties. An element is a metalloid if it’s near the diagonal line running down and right across the p block. Elements less often recognised as metalloids are ordinarily classified as either metals or nonmetals.

Complete step by step answer:
A metalloid is a type of chemical element which has a bulk of properties in between, or that are a mixture of, those of metals and non-metals. Neither there is a standard definition of a metalloid, nor complete agreement on the elements classified as such. In spite of the lack of specificity, the term remains in use in the literature of chemistry. The six mostly recognised metalloids are boron, silicon, germanium, arsenic, antimony, and tellurium. The five elements are less frequently so classified: carbon, aluminium, selenium, polonium, and astatine. On a standard periodic table, all eleven elements are located in a diagonal region of the p-block extending from boron at the upper left to astatine at lower right. Some periodic tables include a dividing line between metals and nonmetals, and the metalloids may be found close to this line.
Thus, we know that the Metalloids are Boron, silicon, germanium, arsenic, antimony, tellurium, polonium, astatine.

Therefore, the correct answer is option (C).

Note: Metalloids usually look like metals but behave largely like non-metals. Their physical behaviour includes, shiny, brittle solids with intermediate to relatively good electrical conductivity and the electronic band structure of a semimetal or semiconductor. They mostly behave as (weak) non-metals chemically, have intermediate ionization energies and electronegativity values, and amphoteric or weakly acidic oxides. They can form alloys with metals. Most of their other physical and chemical properties are intermediate in nature.