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Europium is a chemical element; it has symbol Eu and atomic number 63. It is a silvery-white metal of the lanthanide series that reacts readily with air to form a dark oxide coating. Europium is the most chemically reactive, least dense, and softest of the lanthanides. It is soft enough to be cut with a knife.
Europium compounds are compounds formed by the lanthanide metal europium (Eu). In these compounds, europium generally exhibits the +3 oxidation state, such as EuCl 3, Eu(NO 3) 3 and Eu(CH 3 COO) 3. Compounds with europium in the +2 oxidation state are also known. The +2 ion of europium is the most stable divalent ion of lanthanide metals in ...
A common approximate synonym for South Asia is the Indian subcontinent which excludes Afghanistan. Southeast Asia Commonly understood as comprising the ASEAN countries of Brunei, Cambodia, East Timor, Indonesia, Laos, Malaysia, Myanmar, the Philippines, Singapore, Thailand, and Vietnam. [18]
Eurasia (/ j ʊəˈr eɪ ʒ ə / yoor-AY-zhə, also UK: /-ʃ ə /-shə) is the largest continental area on Earth, comprising all of Europe and Asia. [3] [4] According to some geographers, physiographically, Eurasia is a single supercontinent. [4]
However, the Ural River is the most common division used by authorities, [86] [97] [100] is the most prominent natural feature in the region, and is the "most satisfactory of those (options) proposed" [101] which include the Emba River, a much smaller stream cutting further into Central Asian Kazakhstan.
This is a list of countries with territory that straddles more than one continent, known as transcontinental states or intercontinental states. [1]Contiguous transcontinental countries are states that have one continuous or immediately-adjacent piece of territory that spans a continental boundary, most commonly the line that separates Asia and Europe.
There are 27 currencies currently used in the 50 countries of Europe. All de facto present currencies in Europe, and an incomplete list of the preceding currency, are listed here. In Europe, the most commonly used currency is the euro (used by 26 countries); any country entering the European Union (EU) is expected to join the eurozone [ 1 ...
In medieval T and O maps, Asia makes for half the world's landmass, with Africa and Europe accounting for a quarter each. With the High Middle Ages, Southwest and Central Asia receive better resolution in Muslim geography, and the 11th century map by Mahmud al-Kashgari is the first world map drawn from a Central Asian point of view.