GERMANIUM

The germanium is a chemical element with atomic number 32, and symbol Ge belonging to the group 4 of the periodic table of the elements.
It is a solid hard, crystalline metal, of white greyish glossy and fragile color. He presents the same crystalline structure that the diamond and it resists to the acids. The germanium is very distributed in the terrestrial bark The properties of the germanium (of the Latin Slang, Germany) they were predicted in 1871 by Mendeleyev depending on his position in the periodic table. The German Clemens Winkler demonstrated in 1886 the existence of this element.
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CHLORINE

The chlorine is a chemical element of atomic placed number 17 in the group of the halogens of the periodic table of the elements. His symbol is A Cl.
The chlorine (of the Greek χλωρος, that it means " yellow greenish ") was discovered in his form biatómica in 1774 by the Swedish Carl Wilhelm Scheele, though the first electrolytic process for the production of chlorine was patented in 1851 by Charles Watt in Great Britain. In 1810 the chemical Englishman Humphry Davy demonstrates that it is a question of a chemical element and gives the name of chlorine due to his color.
It is a toxic yellow - greenish gas formed by molecules biatómicas.

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LUTECIO

The lutecio is a chemical element of atomic number 71 which chemical symbol is Lu. His name comes from the former name of the city of Paris, in Latin, Lutetia.

The lutecio is a trivalent metal of white color silvering resistant to the corrosion and relatively stablly in air presence. It is the heaviest and hard element of all the rare lands.

The lutecio, was discovered of independent form in 1907 by the French scientist Georges Urbain and the mineralogist Carol Auer von Welsbach.

The metal is a silver and relatively stable white in the air. The pure metal lutecio has been isolated only in the recent years and is one of the most difficult to prepare.

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BROMINE

The bromine is a chemical element of atomic placed number 35 in the group of the halogens of the periodic table of the elements. His symbol is Br and comes from the Greek as bromines, stink.
It was discovered in 1826 by Antoine-Jérôme Balard, but it was not obtained in important quantities until 1860.
The bromine to temperature environment is a red, volatile and dense liquid. His reactivity is intermediate between the chlorine and the iodine.
This chemical element comes from Greek and means bromines, stink.
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HELIUM

The helium is a chemical element of atomic number 2, symbol. Him one places in the group 18 of the periodic table of the elements. He presents the properties of a rare gas.

During a solar eclipse in 1868, the French astronomer Pierre Janssen observed a spectral yellow line in the solar light that up to this moment was not known. Norman Lockyer observed the same eclipse and proposed that the above mentioned line was produced by a new element, to which it called helium, with which, both to Lockyer and to Janssen they there was awarded the discovery of this element.
The helium uses in cryogenics and in the refrigeration of magnets superconductors.
The helium is the most light second element and the second most abundant in the universe.
In normal conditions of pressure and temperature the helium is a not inflammable gas.

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BERYLLIUM

The beryllium is a chemical element of symbol Be and atomic number 4. It is an element alcalinotérreo, emerald of green, hard, light and fragile color. It uses principally as stiffener in alloys, specially of copper.
The beryllium (of the Greek βερυλλoς Beryl) or glucinio (of the Englishman glucinium and this one of the Greek γλυκυς, sweet) for the flavor of his you go out, it was discovered by Vauquelin in 1798 in the shape of oxide in the beryl and the emerald. Friedrich Wöhler and A. A. Bussy of independent form isolated the metal in 1828 by means of reaction of potassium with chloride of beryllium.
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HYDROGEN

The hydrogen is a chemical element represented by the symbol H and with an atomic number of 1.
Of the Latin "hydrogenium", and this one of the ancient Greek ὕδωρ (Hydor): "does" "it" "water down" and γένος-ου (Genos): "generator". " Water generator ".
The hydrogen was obtained by the first time by Paracelso, obtained it artificially but it was not conscious that was producing another chemical new element, afterwards Boyle it of re-discovered and saw that hydrogen was taking place. Information obtained of www.wikipedia.org

URANIUM

It is a chemical element which chemical symbol is Or and his atomic number is 92. His name comes from the planet Uranus. It was discovered in 1789 by M. H. Klaproth that it called this way in honor of the planet Uranus that had just been an overdraft in 1781. It decides to put the name of the above mentioned planet to the mineral, because of it the metal that is obtained of him, he will be known like "uranium" (that comes from the Latin) that will give the Spanish uranium, beginning here the astronomic nomenclature of the chemical elements.
His previous symbol was Ur.

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mercury

It is a chemical elemnto whose symbol is HG .Debe his name to the planet of the same name, which is the first planet of the solar system.

Due to a water plant, called Hydrágiros (of the Greek)

Hydrágiros was meaning water of silver, or liquid silver. It is weighed and capablly of flowing and running, since it was not spreading as the water.

Teofrasto explains another way of obtaining mercury, revealing cinnabar with iron.

The Romans started using it (they were calling her Argentum Vivum). In the Middle Ages there begin to be identified the adverse effects of the use of mercury.

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NITROGEN

The nitrogen is a chemical element of atomic number 7, symbol N. The nitrogen (of the Latin nitrum-i and this one of the Greek νίτρον "saltpeter", and-geno, of the Greek γεν--, "to "generate") thinks that it was discovered formally by Daniel Rutherford in 1772 on having announced some of his properties.
The nitrogen is a gas so inert that Lavoisier was referring to him as scourge (nitrogen) that it means without life. It qualified between the permanent gases, especially since Faraday it was not managing to see liquid to 50 atm and-110 °C, up to the experiments of Pictet and Cailletet that in 1877 managed to liquefy it. The compounds of nitrogen already were known in the Middle Ages; this way, the alchemists were calling aqua fortis to the nitric acid and aqua royal (royal water) to the mixture of nitric and hydrochloric acid, known by his aptitude to dissolve the gold.
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ARGON

The argon is a chemical element of atomic number 18 and symbol Ar. It is the third party and inert of the rare, colorless gases as them, constitutes concerning 1 % of the air.

Henry Cavendish, in 1785, exposed a sample of nitrogen to electrical unloads repeated in presence of oxygen to form oxide of nitrogen that later it was eliminating and thought that about 1 % of the original gas could not dissolve, affirming then that not all the " air flogisticado " was a nitrogen.

In 1892 Lord Rayleigh discovered that the atmospheric nitrogen had a major density that the pure nitrogen obtained from the saltpeter. Did Rayleigh and William Ramsay demonstrate that the difference owed to itself to the presence of the second gas little reagent heavier than the nitrogen, announcing the discovery of the argon (from the Greek to?? Ó?, Argus, inactive, vague or lazy) in 1894, it announced that it was received by enough skepticism by the scientific community.

In 1904 Rayleigh it received the prize Nobel prize of Physics for his investigations brings over of the density of the most important gases and the discovery of the existence of the argon.

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OXYGEN

The oxygen is a chemical element of atomic number 8 and symbol Or.
Traditionally this discovery has been attributed to the chemist Englishman Joseph Priestley (1733-1804), who discovered it in an independent way in 1772, though the first one that published a work on this gas and him gave name he was the chemical Frenchman Lavoisier (1743-1794) in 1777. Did it use for it two Greek ὀξύς (Oxýs) (acid, "literally "sharp", for the flavor of the acids) -γενής (-genes) generator, which it generates "), because he believed that the oxygen was the indispensable constituent one of the acids.
The oxygen is the most abundant third element in the Sun, and plays a role in the cycle of the carbon - nitrogen, a process responsible for the production of stellar energy.
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NEPTUNIO

The neptunio is a synthetic element of the periodic table which symbol is Np and his atomic number is 93. It comes from the planet of the same name. The neptunio is a radioactive metal of the "rare" lands and has at least 3 allotropic forms. Quarter of the family of the actínidos or the second period of transition hospitalizes of the periodic system of the elements.
It was obtained by the first time in 1940 by McMillan and Abelson bombarding uranium with deuterones with great speed. The isotope 237 has been found, in very small quantities, in mines of uranium.
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CHROME

The chrome is a chemical element of atomic number 24 that is in the group 6 of the periodic table of the elements. His symbol is Cr. It is a metal, hardly, fragile, steely and brilliant grey. Of the Greek khroma, color, for the usefulness that the combinations of the chrome have in painting. Siberia red of lead (crocoíta) is a mineral of chrome estimated as a red pigment for paintings of oil. Emerald is Beryl's form (a silicate of aluminium, beryllium), which is of green color due to the incorporation of a bit of chrome in the network crytal Beryl instead of some of the ions of aluminium.

It was discovered by Vaughlin in 1797.

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PLUTONIUM

The plutonium is the second element of the series of the actínidos in being an overdraft. His atomic number is 94. For the present of major importance it is the isotope 239 Pu, which has an average life of more than 20000 years. It is a metallic radioactive element that is in use in reactors and nuclear weapon. It is one of the elements transuránicos of the group of the actínidos of the periodic system. His name derives from the Roman god of the hells, Pluto (mythology).
The isotopes of the plutonium were prepared and studied by the first time by the American chemist Glenn T. Seaborg and his companions of the University of California in Berkeley, in 1940. They have found minor quantities of the element in the mines of uranium, but at present relatively big quantities of plutonium are prepared in the nuclear reactors.
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CERIUM

The cerium is a chemical element of symbol Ce and is one of 14 chemical elements that follow the lantano in the periodic table, named by it lantánidos. It is malleable, of gray color metal-worker similar to the iron, becomes dun reddish on having exposed it to the air and is a very scanty element in the terrestrial bark, where it turns out to be dispersed in diverse minerals, as the cerita and monacita.
It was discovered in 1803 by Martin Heinrich Klaproth y Jöns Jacob Berzelius and independently by Wilhelm von Hisinger. It took his Ceres's name, the small planet that one had found two years before. It is the most abundant of the metals of the rare lands and is in the minerals, included Allanita, monacita and Cerita. There are big deposits found in the India, Brazil and the USA.
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MAGNESIUM

The magnesium is the chemical element of symbol Mg and atomic number 12.

The name comes from Magnesia, which in Greek was designating Tesalia's region (Greece). The Englishman Joseph Black recognized the magnesium as a chemical element in 1755. In 1808 Humphry Davy it obtained pure metal by means of electrolysis of a mixture of magnesia and HgO.

The magnesium is the most abundant eighth element in the bark of the Earth, though he is not in his elementary form. It is a question as an element of the group 2, which are called alkaline metals. It is an important element for the vegetable and animal life.

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TITANIUM

The titanium is a chemical element, of symbol You and atomic number 22. Silver treats itself about a metal of transition of gray color. It has high resistance to the corrosion and great mechanical resistance. It possesses mechanical properties similar to the steel, so much cigar as in the alloys that it forms. The titanium was declared strategic material on the part of The United States for many years and it can form alloys with other elements, such as iron, aluminium, vanadium, molybdenum.
The titanium (called this way by the Titans, children of Uranus and Gea in the Greek mythology) was discovered in England by William Gregor, in 1791, when a metal of color was studying grey - silver that he had found. Little later, in 1795, the German chemist Martin Kalprotz, discoverer also of the uranium, gave the name of titanium. The titanium is present in the meteorites and in the Sun.

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RENNET

The rennet is a chemical element of the periodic table of atomic number 31 and symbol Ga. It is a soft, greyish metal in liquid state and brilliant silvering on having hardened.
The rennet (of the Latin Gallia, France), was discovered by means of espectroscopia by Lecoq de Boisbaudran in 1875 by his characteristic spectrum (two ultraviolet lines) on having examined a blende of zinc proceeding from the Pyrenees. The solid rennet looks like a bluish grey when it is exposed to the atmosphere. The liquid rennet is a silver white.
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SELENIUM

The selenium is a chemical element of the periodic table which symbol is and his atomic number is 34.
The selenium (of the Greek σελήνιον, radiance of the Moon) it was discovered in 1817 by Jöns Jacob Berzelius. On having visited the factory of Gripsholm's sulphuric acid it observed a dun reddish liquid that warmed to the blowpipe was detaching a stinking smell that was considered to be at the time typically and exclusive of the tellurium, in fact his name derives from his relation with this element since tellurium comes from the Latin Tellus, the Earth.
The selenium is very distributed in the terrestrial bark in the majority of the rocks and soils. It is possible to find in several allotropic forms.

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