- Plutonium (Wikipedia)
Plutonium is a chemical element; it has symbol Pu and atomic number 94. It is a silvery-gray actinide metal that tarnishes when exposed to air, and forms a dull coating when oxidized. The element normally exhibits six allotropes and four oxidation states. It reacts with carbon, halogens, nitrogen, silicon, and hydrogen. When exposed to moist air, it forms oxides and hydrides that can expand the sample up to 70% in volume, which in turn flake off as a powder that is pyrophoric. It is radioactive and can accumulate in bones, which makes the handling of plutonium dangerous.
the other doubly landlocked country
- Liechtenstein (Wikipedia)
Liechtenstein (/ˈlɪktənstaɪn/, LIK-tən-styne; German: [ˈlɪçtn̩ʃtaɪn]), officially the Principality of Liechtenstein (German: Fürstentum Liechtenstein, [ˈfʏʁstn̩tuːm ˈlɪçtn̩ˌʃtaɪ̯n]), is a doubly landlocked German-speaking microstate in the Central European Alps, between Austria in the east and north and Switzerland in the west and south. Liechtenstein is a semi-constitutional monarchy headed by the prince of Liechtenstein of the House of Liechtenstein, currently led by Hans-Adam II. It is Europe’s fourth-smallest country, with an area of just over 160 square kilometres (62 square miles) and a population of 40,023. It is the world’s smallest country to border two countries, and is one of the few countries with no debt.
