Wikipedia:Main Page history/2014 October 4

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Antimony

A metalloid is a chemical element that has properties in between those of metals and nonmetals. There is no standard definition of a metalloid, nor is there agreement as to which elements are appropriately classified as such. Despite this uncertainty, the term remains in use in chemistry literature. The six commonly recognised metalloids are boron, silicon, germanium, arsenic, antimony (pictured) and tellurium. Elements less commonly recognised as metalloids include carbon, aluminium, selenium, polonium and astatine. Typical metalloids have a metallic appearance but are brittle and only fair conductors of electricity. Chemically, they mostly behave as weak nonmetals. They can form alloys with metals. Most of their other properties are intermediate in nature. Metalloids and their compounds are used in alloys, biological agents, flame retardants, glasses, optical storage and optoelectronics, pyrotechnics, semiconductors and electronics. The term metalloid originally referred to nonmetals. Its more recent meaning, as a category of elements with intermediate properties, became widespread in 1940–1960. Metalloids are sometimes called semimetals, a practice that has been discouraged. (Full article...)

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On this day...

October 4: First day of Eid al-Adha (Islam, 2014); Yom Kippur ends at nightfall (Judaism, 2014); Feast day of St. Francis of Assisi (Catholicism)

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Mount Merapi

Mount Merapi is a stratovolcano located about 28 kilometres (17 miles) north of Yogyakarta, Indonesia. It has erupted regularly since the 16th century. This Decade Volcano's eruptions in 2010 killed more than 350 people, leading to an exclusion zone of 2.5 kilometres (1.6 mi) from the peak.

Photo: Chris Woodrich

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