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Chemical elements Reference Libraries

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Acid Rain
2013-04-01 10:21:17

Acid rain is any form of precipitation that is unusually acidic, meaning that is possesses high levels of hydrogen ions. It can have harmful effects on aquatic animals, plants, and infrastructure. Acid rain is caused by emissions of sulfur dioxide and nitrogen oxide, which react with the water molecules within the atmosphere to produce acids. Nitrogen oxides can be produced naturally by...

Spectroheliograph
2010-10-28 18:40:42

The spectroheliograph captures a photographic image of the Sun at a single wavelength of light. The wavelength chosen usually coincides with a spectral wavelength of one of the chemical elements present in the Sun. George Ellery Hale and Henri-Alexadre Deslandres developed I independently in 1890 and was further refined in 1932 by Robert R. McMath to take motion pictures. It operates by...

Fermium
2009-07-17 12:29:12

Fermium is a synthetic, radioactive metallic element. It has the symbol Fm and atomic number 100. It is an element in the actinide series. It is named after nuclear physicist Enrico Fermi. Fermium became the eighth transuranic (having an atomic number greater than 92) element discovered. It was first discovered in 1952 by a team of scientists led by Albert Ghiorso. They found fermium-255 in...

Europium
2009-07-17 12:16:59

Europium is a chemical element with the symbol Eu and atomic number 63. Europium is named after the continent Europe. It is the most reactive of the rare earth elements. It rapidly oxidizes in air. Europium ignites in the air at around 302 degrees Fahrenheit. It is quite pliable (bendable). Although it was first discovered by Paul Émile Lecoq de Boisbaudran in 1890, it is usually credited...

Erbium
2009-07-17 11:41:58

Erbium is a chemical element with the symbol Er and atomic number 68. Erbium is a rare, silvery-white metallic lanthanide (an element having an atomic number between 57 and 71). It is found solid in its natural state and is commonly found with several other elements in the mineral gadolinite. It is found in Ytterby, Sweden. Erbium was discovered by Carl Gustaf Mosander in 1843. Mosander...

Einsteinium
2009-07-14 16:50:21

Einsteinium is a metallic synthetic element with the symbol Es and atomic number 99. It became the seventh transuranic (atomic number higher than 99) element produced. It was named for Albert Einstein. It is an element found within the actinoid series which includes Actinium. Though it has only been produced in small amounts, it has been accurately determined to be silver in coloration. Like...

Dysprosium
2009-07-14 16:40:55

Dysprosium is a chemical element with the symbol Dy and atomic number 66. This rare earth element has a metallic, bright silver luster. Dysprosium is not found freely in nature, but is found in various minerals, especially xenotime. It was first identified in 1886, but its pure form was not isolated until the use of ion exchange instruments were developed in the 1950s. Dysprosium salts are...

Curium
2009-07-14 16:04:19

Curium is a synthetic radioactive chemical element with the symbol Cm and atomic number 96. This transuranic (atomic number greater than 92) element of the actinide series is produced by bombarding plutonium with helium ions. Curium does not occur naturally. A few commercial applications utilize the production of curium, but someday it may be useful in other areas including radioisotope...

Californium
2009-07-10 13:01:43

Californium is a metallic chemical element. It has the symbol Cf and the atomic number 98. This is a radioactive transuranic (atomic number greater than 92) element. Californium is used for starting nuclear reactors, optimizing coal power plants, the treatment of cancer, and oil drilling. It was first produced by bombarding curium with helium ions. It was first synthesized in 1950 at UC...

Cesium
2009-07-10 12:54:52

Cesium (or Caesium) is a chemical element with the symbol Cs and atomic number 55. Caesium is a soft alkali metal that is silvery-gold. It melts and liquefies at 83 degrees Fahrenheit and is one of only five metals that are liquid close to room temperature. Caesium is a metal that is most widely known for its use in atomic clocks. Cesium comes from the Latin word caesius meaning...

Word of the Day
inwit
  • Inward knowledge; understanding; conscience.
The word 'inwit' comes from Middle English inwit ("mind, reason, intellect, understanding; soul, spirit; feeling; the collection of inner faculties; one of five inner faculties; one of the outer bodily senses.; inward awareness of right or wrong, conscience"), from Old English *inwitt, inġewitnes ("consciousness, conscience, knowledge, knowing"), equivalent to in- +‎ wit. (Wiktionary)
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