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Topic: Timeline of chemical element discovery

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  Discoveries of the chemical elements - Wikipedia, the free encyclopedia
The elements are listed generally in the order in which they were first isolated as the pure element, rather than as a compound (some such as boron were known to be elements decades before they could be isolated from their compounds).
The next element discovered when Mosander showed that the cerium isolated in 1803 by Berzelius was actually a mixture of cerium, lanthanum and so-called didymium (which was not actually one element, and was resolved into two in 1885).
The discovery of technetium finally filled in a puzzling gap in the periodic table, and the discovery that there were no stable isotopes of technetium explained its absence on earth: its 4.2 million years half-life meant that none remained from the time of formation of the earth.
en.wikipedia.org /wiki/Discovery_of_the_chemical_elements   (1313 words)

 Chemistry - Open Encyclopedia   (Site not responding. Last check: 2007-10-22)
An element is a class of atoms which have the same number of protons in the nucleus.
For example, all atoms with 6 protons in their nuclei are atoms of the chemical element carbon, and all atoms with 92 protons in their nuclei are atoms of the element uranium.
Chemical reactions are transformations in the fine structure of molecules.
open-encyclopedia.com /Chemistry   (1382 words)

 The world's top Chemistry websites
Chemistry is the science of the structure, properties, composition, and reactions of chemical elements and compounds.
An element is a material that consists of atoms with a given number of protons in the nucleus.
Chemical reactions are transformations in the structure of molecules.
dirs.org /dir-wiki.cfm/Top/Science/Chemistry   (1012 words)

 Chemistry   (Site not responding. Last check: 2007-10-22)
Biochemistry : Biochemistry is the study of the chemicals, chemical reactions and chemical interactions that take place in living organisms.
Inorganic chemistry : Inorganic chemistry is the study of the properties and reactions of inorganic compounds.
Dalton's law of multiple proportions says that these chemicals will present themselves in proportions that are small whole numbers (i.e.
www.worldhistory.com /wiki/C/Chemistry.htm   (1521 words)

 discovery of the chemical elements   (Site not responding. Last check: 2007-10-22)
At this point, Sir Humphry Davy pioneered the use of electricity from the Voltaic pile to decompose the salts of alkali metals, and so a number of thse metals were first prepared as the pure element: the beginning of the field of electrochemistry.
A number of elements were first identified by their spectroscopic emission lines: caesium and rubidium were discovered by Bunsen and Kirchhoff analysing the spectrum of alkali salts.
The elements labelled as "synthetic" are unstable, with a half-life so "short" relative to the age of the earth that any atoms of that element that may have been present when the earth formed, have long since completely decayed away.
www.yourencyclopedia.net /Discovery_of_the_chemical_elements.html   (1152 words)

 Timeline of chemical element discovery -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-10-22)
(A nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust) Oxygen discovered by (English chemist who isolated many gases and discovered oxygen (independently of Scheele) (1733-1804)) Joseph Priestley.
(A lustrous gray strong metallic element resembling titanium; it is used in nuclear reactors as a neutron absorber; it occurs in baddeleyite but is obtained chiefly from zircon) Zirconium discovered by (German chemist who pioneered analytical chemistry and discovered three new elements (1743-1817)) Martin Heinrich Klaproth.
(A light soft silver-white metallic element of the alkali metal group; oxidizes rapidly in air and reacts violently with water; is abundant in nature in combined forms occurring in sea water and in carnallite and kainite and sylvite) Potassium discovered (additional info and facts about Humphry Davy) Humphry Davy.
www.absoluteastronomy.com /encyclopedia/t/ti/timeline_of_chemical_element_discovery.htm   (4267 words)

 Learn more about Chemistry in the online encyclopedia.   (Site not responding. Last check: 2007-10-22)
Chemistry is the study of the atomic building blocks of nature, how they combine and their combinations which form the solids, liquids, and gases that make up most forms of matter.
Another key discovery in chemistry was that when a change is made, the amount of energy gained or lost will always be the same.
Often, discoveries in chemistry are made by physicists, biologists, chemical engineers or pharmacists.
www.onlineencyclopedia.org /c/ch/chemistry.html   (586 words)

 Dictionary Ti   (Site not responding. Last check: 2007-10-22)
Timeline of U.S. attack on Afghanistan in December 2001
Timeline of U.S. attack on Afghanistan in November 2001
Timeline of U.S. attack on Afghanistan in October 2001
www.dictionarydefinition.net /Ti.html   (146 words)

 List of themed timelines - Wikipedia, the free encyclopedia
Timeline is a 2003 film based on the novel.
Chronologies or timelines are important in understanding history.
General: List of years in science, Timeline of scientific discoveries, Timeline of scientific experiments, Timeline of environmental history of New Zealand, Timeline of Islamic science and technology, Timeline of Polish science and technology
en.wikipedia.org /wiki/Timeline   (422 words)

 Phosphine   (Site not responding. Last check: 2007-10-22)
For farm use it is often sold the form of Aluminium phosphide pellets which yield phosphine on with atmospheric water.
These pellets also contain chemicals which evolve ammonia which helps to reduce the potential spontaneous ignition or explosion of the phosphine They also contain other agents (e.g.
White oval, Brown oval, Timeline of chemical element isolation, Size, Amon Goeth, Cassini Division, Timeline of chemical element discovery, Jobriath, Megalopidae, Mt.
www.freeglossary.com /Phosphine   (175 words)

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It is the story of plant discovery and use, and addresses the roles of plants in human civilization.
The TimeLine also provides you as an individual the opportunity to reflect on how the history of human interaction with the plant world has shaped and impacted your own life and heritage.
Having arisen when the stars were formed, the elements of which life is built, and thus we ourselves, might be thought of as stardust.
www.huntington.org /BotanicalDiv/Timeline.html   (8912 words)

 Science World: Name that element! - New Science Mystery Series!
In the 19th century, the element was used to dye wallpaper and could have slowly seeped out of his walls as a deadly gas.
This toxic element is used to make computer chips because it's a semiconductor: When combined with another metal, it can shuffle electrons (negatively charged particles that orbit around an atom's nucleus, or center) to generate an electrical current.
C Elements in the two left-hand columns of the periodic table are inert (don't react with other elements).
www.findarticles.com /p/articles/mi_m1590/is_8_59/ai_97235874   (1188 words)

 Medieval Technology Pages - Overview of Chemical Technology
The discovery of gold (which occurs native) may have preceded the discovery of copper, as perhaps did the discovery of silver (which also occurs native).
Thus already by the 3rd century chemical technology had spawned alchemy (the term is chemistry with the Arabic article al- prefixed to it.) Alchemy became associated with mystery and with Hermes Trismegistos, a person invented by the Gnostics as the source of all hidden wisdom.
The Arabs vastly extended chemical knowlege on a practical level and it was only during the 11th century and after that this information became known in Europe.
scholar.chem.nyu.edu /tekpages/ctechover.html   (643 words)

 Encyclopedia: Timeline of chemical element discovery   (Site not responding. Last check: 2007-10-22)
Jean Charles Galinard de Marignac (April 24, 1817 - April 15, 1894) was a Swiss chemist whose work with atomic weights suggested the possibility of isotopes and the packing fraction of nuclei and whose study of the rare earth elements led to his discovery of ytterbium in 1878 and codiscovery of...
University of California, Berkeley The University of California, Berkeley (also known as Cal, UC Berkeley, UCB, or simply Berkeley) is a public coeducational university situated in the foothills of Berkeley, California, USA to the east of San Francisco Bay, overlooking the Golden Gate.
Chemical elements The story of the discoveries of the chemical elements is presented here in chronological order.
www.nationmaster.com /encyclopedia/Timeline-of-chemical-element-discovery   (7679 words)

 Chemical Engineering   (Site not responding. Last check: 2007-10-22)
Chemical Engineers are employed around the globe in a world class, largely graduate, profession.
Chemical Engineers are found in a wide range of industries from chemicals and bio-chemicals to energy, food and drink, pharmaceuticals and health care.
Chemical Engineers have the multi-disciplinary skills that keep their options open and they are valued and well rewarded in many kinds of employment.
www.edasolutions.com /Groups/ChemicalEngineering.htm   (2097 words)

 Chemistry Highlights - What Happened and When?
Berzelius J.J. Classified minerals chemically; discovered and isolated many elements (Se, Th, Si, Ti, Zr); coined the terms isomer and catalyst; noted existence of radicals; anticipated discovery of colloids.
This discovery was the beginning of synthetic organic chemistry.
Moseley, Henry G.J. discovered the relation between frequency of x-rays emitted by an element and its atomic number, thus indicating the element’s true position in the Periodic Table.
www.chemistry.co.nz /chronology.htm   (1042 words)

 Timeline of chemical element discovery - Open Encyclopedia   (Site not responding. Last check: 2007-10-22)
Timeline of chemical element discovery - Open Encyclopedia
This article should be merged with Discoveries of the chemical elements
Some elements have been known since time immemorial.
www.open-encyclopedia.com /Timeline_of_chemical_element_discovery   (582 words)

 NOAA Ocean Explorer: History: Timeline
The discovery occurs as the ship is conducting sounding operations with a Thomson Sounding Machine.
It is not the first undersea mountain to be discovered, as the Tuscarora had sounded on a number of seamounts west of Hawaii in early 1874.
Called the PIONEER Survey, this survey was called one of the most significant geophysical surveys ever conducted as it provided a key element to the Theory of Plate Tectonics.
oceanexplorer.noaa.gov /history/timeline/timeline.html   (2206 words)

 Search Results for self-discovery -¬†Encyclop√¶dia Britannica
Faraday, the greatest experimentalist in electricity and magnetism of the 19th century and one of the greatest experimental physicists of all time, worked on and off for 10 years trying to prove that...
Chemical element of the actinide series (with many transition element...
Timeline on the milestones in scientific studies and discoveries from Sigmund Freud’s The Interpretations of Dreams to the search for behavioral genes.
www.britannica.com /search?query=self-discovery&submit=Find&source=MWTEXT   (458 words)

 Atomic Structure Timeline   (Site not responding. Last check: 2007-10-22)
He discovered that the properties of elements "were periodic functions of the their atomic weights".
He wrote"The atomic number of an element is equal to the number of protons in the nucleus".
Synthesized 6 transuranium elements and suggested a change in the layout of the periodic table.
www.watertown.k12.wi.us /HS/Staff/Buescher/atomtime.asp   (835 words)

 Site Contents at the free Online Encyclopedia.   (Site not responding. Last check: 2007-10-22)
You are here: Online Encyclopedia > Site Map pg 7 > Timeline of Slovene...
Timeline of U.S. attack on Afghanistan in January 2002
In a household, clothes hangers are the single one item that you own the most of, yet no one can name even one brand?
www.onlineencyclopedia.org /index_321.html   (136 words)

 The world's top Education websites   (Site not responding. Last check: 2007-10-22)
Discusses atoms and their components, the periodic table, its functions and the basic elements.
Free software with standards-based teaching materials that assist students in studying elements and creating their own model of the periodic table of elements.
Identify the chemical symbol given the element name, and the element name given the chemical symbol.
dirs.org /dir-wiki.cfm/Top/Science/Chemistry/Education   (2817 words)

 Chemistry   (Site not responding. Last check: 2007-10-22)
One of the very first laws to be discovered leading to the establishment of chemistry as a science is the Law of Conservation of Mass.
On a superficial level this means that if we start off with 10,000 atoms and proceed with many chemical reactions, we will still be left with exactly 10,000 atoms.
College students typically study chemistry in the following "blocks": analytical chemistry, physical chemistry, organic chemistry, inorganic chemistry, polymer chemistry and biochemistry.
www.enlightenweb.net /c/ch/chemistry.html   (501 words)

 The world's top Employment websites   (Site not responding. Last check: 2007-10-22)
Positions for chemists in the chemical industry and academia.
Also carries vacancies in positions allied to chemistry, e.g from the biochemical and the pharmaceutical sectors.
An employment resource for the chemical industry, Chemistrywork.com is dedicated to helping chemistry professionals worldwide find the right job.
dirs.org /dir-wiki.cfm/Top/Science/Chemistry/Employment   (937 words)

 Timeline of chemical element discovery - Information
Looking For timeline of chemical element discovery - Find timeline of chemical element discovery and more at Lycos Search.
Find timeline of chemical element discovery - Your relevant result is a click away!
See the original editable 'Timeline of chemical element discovery' article.
www.logicjungle.com /wiki/Timeline_of_chemical_element_discovery   (733 words)

 Spaceflight Now | Breaking News | Revealing colorful element formations in ancient stars
Astronomers studying how elements heavier than iron were produced in the early Milky Way have identified a distinct series of epochs of galaxy-wide chemical formation.
This evolutionary timeline, stretching from the Big Bang onward for several billion years, has the potential to serve as a cosmic "fingerprint manual" that could help astronomers categorize some of the quirky high-redshift galaxies seen in recent samples of the ancient Universe, such as the Hubble Deep Field, and in deeper sky surveys to come.
The earliest stages of heavy element formation in the Galaxy were dominated by stars with masses ten times that of the Sun or more, and lifetimes of a few million years or less.
spaceflightnow.com /news/n0011/27ancient   (1164 words)

The new picture of the earliest Earth is based on a single, tiny grain of zircon from western Australia found and dated by Simon Wilde, of the School of Applied Geology at Curtin University of Technology in Perth, Western Australia.
"The discovery of carbonates of this age provided a missing link as to when and how oxygen began to be introduced into the atmosphere," Bekker says.
Previously, it was thought that any asteroid or comet collision would leave strong evidence of the element iridium, the signal found in the sedimentary layer from the time of the dinosaur extinction.
www.magicdragon.com /UltimateSF/timelineCO.html   (13090 words)

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