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Topic: Group 17 element

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 Halogen - Wikipedia, the free encyclopedia
This article discusses the group of chemical elements in the periodic table:for the light bulb, see the halogen lamp.
They are the elements in Group 17 (old-style: VII or VIIA) of the periodic table: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At) and the as yet undiscovered ununseptium (Uus).
These elements are diatomic molecules in their natural form.
en.wikipedia.org /wiki/Group_17_element   (589 words)

 Group 6 element - Wikipedia, the free encyclopedia
A Group 6 element is the series of elements in group 6 (IUPAC style) in the periodic table, which consists of the transition metals chromium (Cr), molybdenum (Mo), tungsten (W), and seaborgium (Sg).
"Group 6" is the new IUPAC name for this group, the old style name was "group VIA" in the old European system or "group VIB" in the old US system.
Group 6 must not be confused with the group with the old-style group names of either VIB (European system) or VIA (US system) which is now group 16.
en.wikipedia.org /wiki/Group_6_element   (223 words)

 Bromine   (Site not responding. Last check: 2007-10-08)
With many of the metals and elements, anhydrous bromine is less reactive than wet bromine; however, dry bromine reacts vigorously with aluminium, titanium, mercury as well as alkaline earth and alkaline metals.
Elemental bromine is used to manufacture a wide variety of bromine compounds used in industry and agriculture.
Elemental bromine is a strong irritant and, in concentrated form, will produce painful blisters on exposed skin and especially mucous membranes.
www.worldhistory.com /wiki/B/Bromine.htm   (623 words)

 Group 17 element - Hutchinson encyclopedia article about Group 17 element   (Site not responding. Last check: 2007-10-08)
Any of a group of five non-metallic elements with similar chemical bonding properties: fluorine, chlorine, bromine, iodine, and astatine.
They form a linked group (Group 7) in the periodic table, descending from fluorine, the most reactive, to astatine, the least reactive.
The colour of the element darkens going down the group from fluorine, which is pale yellow, to astatine, which is fl.
encyclopedia.farlex.com /Group+17+element   (199 words)

 Main group element
In chemistry and atomic physics, main group elements are groups whose lightest members are represented by hydrogen, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and helium) as arranged in the periodic table of the elements.
The main group elements (with some of the lighter transition metal s) are the most abundant elements on the earth, in the solar system, and in the universe.
Gilheany Group - Enantioselective synthesis, organophosphorus chemistry, organic chemistry of Main Group elements and the synthesis of medium rings and small multicyclic heterocycles.
www.nebulasearch.com /encyclopedia/article/Main_group_element.html   (801 words)

 Periodic table Online Research :: Information about Periodic table   (Site not responding. Last check: 2007-10-08)
A Periodic table group is a vertical column in the periodic table of the elements.
Progressing through a group from lightest element to heaviest element, the outer-shell electrons (those most readily accessible for participation in chemical reactions) are all in the same type of orbital, with a similar shape, but with increasingly higher energy and average distance from the nucleus.
Mendeleev was later vindicated by the discovery of the electronic structure of the elements in the late 19th century and early 20th century.
in-northcarolina.com /search/Periodic_table.html   (1820 words)

The element is a gray-white metalloid, and in its pure state is crystalline and brittle, retaining its lustre in air at room temperature.
Element 109, meitnerium, is a synthetic element that is not present in the environment at all.
Elemental selenium is relatively nontoxic and is considered to be an essential trace element.
www.angelfire.com /sc3/fizisist/elements.htm   (9123 words)

 Group 17 element   (Site not responding. Last check: 2007-10-08)
element fifth element diva filter element mercury element calcium element finite element honda element element skateboards element zinc element tungsten element mercury element fire mercury element toxic
Finite Element People List of researchers and scientists that work in using, developing, improving and analyzing finite element methods in various applications.
Elements consist of atoms which have the same number of protons.
www.serebella.com /encyclopedia/article-Group_17_element.html   (404 words)

 Piezoelectric servomechanism apparatus - Patent 4765140   (Site not responding. Last check: 2007-10-08)
A second group of laminated, cylindrical, thin-plate piezoelectric elements is provided in the center of the first group and a working member is provided on the free end of the second group of elements that is not attached to the floating plate.
The first group of piezoelectric elements 17 constructed of a plurality of laminated thin-plate piezoelectric elements and a similarly constructed second group of piezoelectric elements 18 are attached to floating plate 13 on the side opposite to that facing hydraulic chamber 14.
The first and second group 17, 18 are displaced in the same direction, and adhesive need not be applied between floating plate 13 and between the individual piezoelectric elements of both groups 17, 18 because pressure from hydraulic chamber 14 acts on floating plate 13 to keep all the elements together.
www.freepatentsonline.com /4765140.html   (3737 words)

 Group 3 element - Wikipedia, the free encyclopedia
A Group 3 element is the series of elements in group 3 (IUPAC style) of the periodic table, which consists of
All of these elements are classed in Group 3 because their outer shell holds three electrons.
Scandium, yttrium, and the lanthanides (except promethium) can all be found naturally, albeit at very low levels in the Earth's crust, and are collectively called rare-earth metals.
en.wikipedia.org /wiki/Group_3_element   (297 words)

 Chem4Kids.com: Elements & Periodic Table
Elements are the building blocks of all matter.
Sure, they are smaller than the atoms of an element, but only when they group with other quarks do they form atoms that have recognizable traits.
You need to remember that this is the first row with transition elements.
www.chem4kids.com /files/elem_intro.html   (332 words)

 group (mathematics) - Hutchinson encyclopedia article about group (mathematics)   (Site not responding. Last check: 2007-10-08)
In mathematics, a finite or infinite set of elements that can be combined by an operation; formally, a group must satisfy certain conditions.
Group theory is the study of the properties of groups.
Group (as in G-8, Group of 8 Industrialized Nations)
encyclopedia.farlex.com /group+(mathematics)   (112 words)

 FLUORINEWHERE:Live long and STUPID? Fountain of YouthWHERE - the pros and cons of fluoride
Fluorine is a member of the halogen family and is the most active of all elements.
Elemental fluorine is being studied as a rocket propellant as it has an exceptionally high specific impulse value.
The free element has a characteristic pungent odor, detectable in concentrations as low as 20 parts per billion, which is below the safe working level.
www.king.igs.net /~rogersk/fluorine.htm   (1053 words)

 ipedia.com: Group 11 element Article   (Site not responding. Last check: 2007-10-08)
The Group 11 Elements of the periodic table consist of the traditional coinage metals of copper, silver, and gold.
The Group 11 Elements (IB) of the periodic table consist of the traditional coinage metals of copper, silver, and gold.
Silver is also the most thermally conductive element, and the most light reflecting element.
www.ipedia.com /group_11_element.html   (561 words)

 Halogen -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-10-08)
These elements are (Click link for more info and facts about diatomic) diatomic ((physics and chemistry) the simplest structural unit of an element or compound) molecules in their natural form.
This negative ion is referred to as a halide ion; (A compound formed by replacing hydrogen in an acid by a metal (or a radical that acts like a metal)) salts containing these ions are known as (A salt of any halogen acid) halides.
Many synthetic (Any compound of carbon and another element or a radical) organic compounds such as (Generic name for certain synthetic or semisynthetic materials that can be molded or extruded into objects or films or filaments or used for making e.g.
www.absoluteastronomy.com /encyclopedia/h/ha/halogen.htm   (809 words)

 MSN Encarta - Chlorine
The element’s name comes from the Greek word chloros, which means “pale green.” In group 17 (or VIIa) of the periodic table (see Periodic Law), chlorine is one of the halogens.
Elementary chlorine was first isolated in 1774 by the Swedish chemist Carl Wilhelm Scheele, who thought that the gas was a compound; it was not until 1810 that the British chemist Sir Humphry Davy proved that chlorine was an element and gave it its present name.
Chlorine is an active element, reacting with water, organic compounds, and many metals.
ca.encarta.msn.com /encyclopedia_761575662/Chlorine.html   (368 words)

 3.2.17 The GROUP TYPE Data Cards
The names of the group-type variable and, optionally, of group parameters for each group type are specified in this section.
The names of the variables for different group types may be the same.
The names of parameters for different group types may be the same; the names of the group-type variable and parameters (if the latter appear) for a specific group type must all be different.
www.numerical.rl.ac.uk /lancelot/sif/node31.html   (230 words)

 Periodic table   (Site not responding. Last check: 2007-10-08)
A group is a vertical column in the periodic table of the elements.
Despite their similarities in mass (they differ by only a few atomic mass units), they have extremely different properties, as can be seen by looking at their allotropes: diatomic oxygen is a gas that supports burning, diatomic nitrogen is a gas that does not support burning, and carbon is a solid which can be burned.
Mendeleev was later vindicated by the discovery of the electronic structure of the elements in the late 19th and early 20th century.
www.omniknow.com /common/wiki.php?in=en&term=Periodic_table   (2112 words)

 Extensible Markup Language (XML) 1.0 (Third Edition)   (Site not responding. Last check: 2007-10-08)
The root element of any document is considered to have signaled no intentions as regards application space handling, unless it provides a value for this attribute or the attribute is declared with a default value.
Element type declarations often constrain which element types can appear as children of the element.
The content of an element matches a content model if and only if it is possible to trace out a path through the content model, obeying the sequence, choice, and repetition operators and matching each element in the content against an element type in the content model.
www.w3.org /TR/REC-xml   (8474 words)

 ATLAS: Symplectic group S4(17)
(17) are a and b where a is in class 2B, b has order 3, ab has order 145 and ababb has order 5.
Look for an element z such that [a, z] has order greater than 17.
The elements a and b are standard generators.
web.mat.bham.ac.uk /atlas/v2.0/clas/S417   (234 words)

 3.2.17 The GROUP USES Data Cards
It may contain the name, or an array of names, of a group function whose type is to be defined.
On cards the expanded element array name in field 2 must be valid and the integer indices must have been defined in a parameter assignment (see Section 3.2.3).
in field 1, is an indication that particular nonlinear elements a re to be included in a given group.
www.numerical.rl.ac.uk /lancelot/oldsif/node31.html   (677 words)

 Forms in HTML documents   (Site not responding. Last check: 2007-10-08)
element in a form is determined by the object implementation (i.e., it lies outside the scope of this specification).
element is presented as a scrolled list box, this attribute specifies the number of rows in the list that should be visible at the same time.
The actual key sequence that causes tabbing navigation or element activation depends on the configuration of the user agent (e.g., the "tab" key is used for navigation and the "enter" key is used to activate a selected element).
www.w3.org /TR/REC-html40/interact/forms.html   (6102 words)

 Navigator's Diary: 487th Bombardment Group, B-17
One of the many groups of the Eighth Air Force sent to England to participate in this enormous struggle was the 487th Bombardment Group (Heavy), The Gentlemen From Hell.
This story is dedicated to the airmen and ground crews of that group, and to all who served.
A squadron would mount a formation of 13 aircraft; a group had 3 squadrons and would mount 39 aircraft; a wing had 3 groups; a division had a number of wings.
www.combatsim.com /review.php?id=545   (6892 words)

 Working Group 17 Charter Joint Campaign Analysis
This working group’s exchanges foster a heightened appreciation of the role of campaign analysis in the context of current and future DoD decision making concerning military operations, force structure, basing and procurement.
Group participants present and discuss analytical techniques to identify their applicability and limitations in light of current world developments.
WG 17 is part of Composite Group C – Joint Warfare, along with WG 12 (Land and Expeditionary Warfare), WG 13 (Littoral Warfare and Regional Sea Control), WG 14 (Power Projection), WG 15 (Air Power and Combat ID, and WG 16 (Special Operations and OOTW).
www.mors.org /publications/abstracts/morss_charters/wg17_charter.htm   (330 words)

 Astatine   (Site not responding. Last check: 2007-10-08)
With the possible exception of francium, astatine is the rarest naturally occurring element with the total amount in Earth's crust estimated to be less than 1 oz (28 g) at any one time; this amounts to less than one teaspoon of the element.
Astatine (Greek astatos meaning "unstable") was first synthesized in 1940 by Dale R. Corson, K. MacKenzie, and Emilio Segrè of the University of California, Berkeley by barraging bismuth with alpha particles.
Astatine is produced by bombarding bismuth with energetic alpha particles to obtain relatively long-lived At-209 - At-211, which can then be distilled from the target by heating in the presence of air.
www.worldhistory.com /wiki/A/Astatine.htm   (316 words)

 B-17 B-24 Pictures Information 8th Air Force Flying Fortress Liberator Ploesti Schweinfurt Merseberg Berlin missions
I met him just once, and that was inside the nose of a 17 on the cold pre-dawn morning of February 3, 1945.
Fatal mid air collisions over England were all too frequent when bombers assembled and took their slots in the vast bomber stream.
In the overcast early morning of August 12, 1944, a 398th Bomb Group B-17 from Nuthampstead collided with a 392nd Bomb Group B-24 from Wendling.
www.b17sam.com   (1866 words)

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