Wikipedia:Main Page history/2023 September 16b

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From today's featured article  Astatine is a very rare radioactive chemical element with the chemical symbol At and the atomic number 85. It occurs on Earth as the decay product of heavier elements. All its isotopes are short-lived, with half-lives of 8.1 hours or less. The element has never been viewed because a mass large enough to be seen would be immediately vaporized by the heat of its radioactivity. The bulk properties of astatine are not known with any certainty, but they have been predicted based on its similarity to the lighter halogens directly above it in the periodic table: fluorine, chlorine, bromine and especially iodine. It is likely to appear dark or lustrous and may be a semiconductor or a metal. Chemically, several anionic species of astatine are known and most of its compounds resemble those of iodine. It also shows some metallic behavior, and may be able to form a stable monatomic cation in aqueous solution, unlike the lighter halogens. (Full article...)

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Ongoing:  Recent deaths&#58;   On this day September 16  Western terminus of the Northern Xinjiang railway <templatestyles src="Hlist/styles.css"> <ul><li>Vitalis of Savigny ( d. 1122)</li><li>Elisabeth Bagréeff-Speransky  ( b. 1799)</li><li>Vesta Tilley  ( d. 1952)</li><li>Louis Ngwat-Mahop  ( b. 1987)</li></ul> More anniversaries: <templatestyles src="Hlist/styles.css"/> <templatestyles src="Hlist/styles.css"/>
 * In Hanoi, Vietnam, a fire at an apartment building kills at least 56 people.
 * The FIBA Basketball World Cup concludes with Germany defeating Serbia in the final (MVP Dennis Schröder pictured).
 * Storm Daniel causes flooding around the central Mediterranean and the collapse of two dams in Libya, leaving more than 11,300 people dead.
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 * 681 – At the Third Council of Constantinople, Pope Honorius I was posthumously excommunicated, with his support for monothelitism deemed to be heretical.
 * 1844 – Felix Mendelssohn completed the score of the Violin Concerto, his final concerto.
 * 1963 – Malaysia was formed as an independent nation from the Federation of Malaya, the Colony of Singapore, the Crown Colony of North Borneo, and the Crown Colony of Sarawak.
 * 1979 – Eight people escaped from East Germany to West Germany in a home-made hot air balloon.
 * 1990 – Construction of the Northern Xinjiang railway (terminus pictured) was completed between Ürümqi South and Alashankou, linking the railway lines of China and Kazakhstan and adding a sizeable portion to the Eurasian Land Bridge.
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