Yttrium

Yttrium is a chemical element with symbol "Y" and atomic number 39. It is a silvery-metallic transition metal chemically similar to the lanthanides and it has often been classified as a "rare earth element". Yttrium is almost always found combined with the lanthanides in rare earth minerals and is never found in nature as a free element. Its only stable isotope, 89Y, is...

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Strontium

Strontium is a chemical element with symbol "Sr" and atomic number 38. An alkaline earth metal, strontium is a soft silver-white or yellowish metallic element that is highly reactive chemically. The metal turns yellow when exposed to air. Strontium has physical and chemical properties similar to its two neighbors calcium and barium. It occurs naturally in the minerals celestine and strontianite....

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Rubidium

Rubidium is a chemical element with the symbol "Rb" and atomic number 37. Rubidium is a soft, silvery-white metallic element of the alkali metalgroup, with an atomic mass of 85.4678. Elemental rubidium is highly reactive, with properties similar to those of other elements in Group 1, such as very rapid oxidation in air. Rubidium has only one stable isotope, 85Rb. Another isotope, 87Rb,...

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Krypton

Krypton is a fictional planet in the DC Universe and the native world of Superman. In some stories, it is also the native world of Supergirl, Kryptothe Superdog, and Power Girl (albeit an alternate universe version in her case, designated "Krypton-Two"). Krypton has been portrayed consistently as having been destroyed just after Superman's flight from the planet, with exact details of its destruction...

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Bromine

Bromine is a chemical element with the symbol "Br", and atomic number of 35. It is in the halogen group (17). The element was isolated independently by two chemists, Carl Jacob Löwig and Antoine Jerome Balard, in 1825–1826. Elemental bromine is a fuming red-brown liquid at room temperature, corrosive and toxic, with properties between those of chlorine and iodine. Free bromine does...

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