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  1. en.wikipedia.org › wiki › PoloniumPolonium - Wikipedia

    Hace 1 día · Polonium is a radioactive element that exists in two metallic allotropes. The alpha form is the only known example of a simple cubic crystal structure in a single atom basis at STP ( space group Pm 3 m, no. 221). The unit cell has an edge length of 335.2 picometers; the beta form is rhombohedral.

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  2. en.wikipedia.org › wiki › PolandPoland - Wikipedia

    Hace 1 día · Republic of Poland Rzeczpospolita Polska (Polish) Flag Coat of arms Anthem: "Mazurek Dąbrowskiego" [a] ("Poland Is Not Yet Lost") Show globe Show map of Europe Location of Poland (dark green) – in Europe (green & dark grey) – in the European Union (green) – [Legend] Capital and largest city Warsaw 52°13′N 21°02′E  /  52.217°N 21.033°E  / 52.217; 21.033 Official language ...

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