Dr.D is to smart, and he likes rap. <!--emo&:D--><img src='http://www.unknownworlds.com/forums/html/emoticons/biggrin.gif' border='0' style='vertical-align:middle' alt='biggrin.gif'><!--endemo-->
BERKELEY, CA -- Discovery of two new "superheavy" elements has been announced by scientists at the U.S. Department of Energy's Lawrence Berkeley National Laboratory. Element 118 and its immediate decay product, element 116, were discovered at Berkeley Lab's 88-Inch Cyclotron by bombarding targets of lead with an intense beam of high-energy krypton ions. Although both new elements almost instantly decay into other elements, the sequence of decay events is consistent with theories that have long predicted an "island of stability" for nuclei with approximately 114 protons and 184 neutrons. "We jumped over a sea of instability onto an island of stability that theories have been predicting since the 1970s," said nuclear physicist Victor Ninov who was first author of a paper that has been submitted to Physical Review Letters.
Said Ken Gregorich, a nuclear chemist who led the discovery team, "We were able to produce these superheavies using a reaction that, until a few months ago, we had not considered using. However, theoretician Robert Smolanczuk (a visiting Fulbright scholar from the Soltan Institute for Nuclear Studies in Poland) calculated that this reaction should have particularly favorable production rates. Our unexpected success in producing these superheavy elements opens up a whole world of possibilities using similar reactions: new elements and isotopes, tests of nuclear stability and mass models, and a new understanding of nuclear reactions for the production of heavy elements."
Gregorich and Ninov are members of Berkeley Lab's Nuclear Science Division (NSD). Walter Loveland, on sabbatical from Oregon State University, also made major contributions to this work. Other participants from the NSD included long-time leaders in the search for superheavy elements Albert Ghiorso and Darleane Hoffman, plus Diana Lee, Heino Nitsche, Wladyslaw Swiatecki, Uwe Kirbach, Carola Laue, and graduate students from the University of California at Berkeley Jeb Adams, Joshua Patin, Dawn Shaughnessy, Dan Strellis, and Philip Wilk. Hoffman and Nitsche are also professors of chemistry at UC Berkeley.
Noting that four members of the discovery team are German citizens, U.S. Secretary of Energy Bill Richardson, whose department funded this work said, "This stunning discovery which opens the door to further insights into the structure of the atomic nucleus also underscores the value of foreign visitors and what the country would lose if there were a moratorium on foreign visitors at our national labs. Scientific excellence doesn't recognize national boundaries, and we will damage our ability to perform world-class science if we cut off our laboratories from the rest of the world."
The isotope of element 118 with mass number 293 identified at Berkeley Lab contains 118 protons and 175 neutrons in its nucleus. By comparison, the heaviest element found in Nature in sizeable quantities is uranium which, in its most common form, contains 92 protons and 146 neutrons. Transuranic elements in the periodic table can only be synthesized in nuclear reactors or particle accelerators. Though often short-lived, these artificial elements provide scientists with valuable insights into the structure of atomic nuclei and offer opportunities to study the chemical properties of the heaviest elements beyond uranium.
Within less than a millisecond after its creation, the element 118 nucleus decays by emitting an alpha particle, leaving behind an isotope of element 116 with mass number 289, containing 116 protons and 173 neutrons. This daughter, element-116, is also radioactive, alpha-decaying to an isotope of element 114. The chain of successive alpha decays continues until at least element 106.
"In these experiments, observation of a chain of six high-energy alpha decays within about one second unambiguously signaled the production and decay of element 118," says Gregorich. "During 11 days of experiments, three such alpha-decay chains were observed indicating production of three atoms of element 118. The decay energies and lifetimes measured for these new isotopes of elements 118, 116, 114, 112, 110, 108, and 106 provide strong support for the existence of the predicted island of stability."
Referring to these results, discovery-team member Hoffman said, "After a 30-year search, this discovery is extremely gratifying. I only wish Glenn Seaborg had been alive to see these results." Seaborg, the recently deceased Nobel laureate chemist and co-discoverer of plutonium and nine other transuranic elements, was one of the earliest and most outspoken advocates of experiments to reach the predicted island of stability.
Elements 118 and 116 were discovered by accelerating a beam of krypton-86 ions to an energy of 449 million electron volts and directing the beam into targets of lead-208. This yielded heavy compound nuclei at low excitation energies.
During the last several years, low excitation energy reactions failed to take scientists beyond element 112, and it was assumed that production rates for heavier elements were too small to extend the periodic table further using this approach. However, the recent calculations of Smolanczuk indicating increased production rates for the Kr-86 + Pb-208 reaction prompted the experimental search for element 118 at Berkeley Lab.
The key to the success of this experiment was the newly constructed Berkeley Gas-filled Separator (BGS). Said Gregorich, "The innovative BGS design has resulted in a separator with unsurpassed efficiency and background suppression which allows us to investigate nuclear reactions with production rates smaller than one atom per week. For these experiments, the strong magnetic fields in the BGS focused the element 118 ions and separated them from all of the interfering reaction products which were produced in much larger quantities."
Another important factor for the experiment's success was the unique ability of the 88-Inch Cyclotron to accelerate neutron-rich isotopes such as krypton-86 to high-energy and high-intensity beams with an average current of approximately 2 trillion ions per second.
"The 88-inch Cyclotron is the only accelerator in the United States at this time that can provide krypton beams at the intensities that this experiment demanded," said Claude Lyneis, the NSD physicist who heads the accelerator facility for Berkeley Lab.
In operation since 1961, the 88-inch Cyclotron has been upgraded with the addition of a high-performance ion sources and can now accelerate beams of ions as light as hydrogen or as heavy as uranium. The 88-Inch Cyclotron is a national user facility serving researchers from around the world for basic and applied studies.
Said I-Yang Lee, scientific director at the 88-Inch Cyclotron, "From the discovery of these two new superheavy elements, it is now clear that the island of stability can be reached. Additionally, similar reactions can be used to produce other elements and isotopes, providing a rich new region for the study of nuclear and even chemical properties."
Berkeley Lab is a U.S. Department of Energy national laboratory located in Berkeley, California. It conducts unclassified scientific research and is managed by the University of California.
Name Krypton Symbol Kr Atomic number 36 Atomic weight 83.80 Density @ 293 K 0.003708 g/cm3 Atomic volume 38.9 cm3/mol Group Noble Gas Discovered 1898
States State (s, l, g) g Melting point 116.6 K Boiling point 119.7 K Heat of fusion 1.638 kJ/mol Heat of vaporization 9.029 kJ/mol
Back to the top
Energies 1st ionization energy 1350.7 kJ/mole Electronegativity 3 2nd ionization energy 2350.3 kJ/mole Electron affinity kJ/mole 3rd ionization energy 3565.1 kJ/mole Specific heat 0.248 J/gK Heat atomization 0 kJ/mole atoms
Oxidation & Electrons Shells 2,8,18,8 Electron configuration [Ar] 3d10 4s2 4p6 Minimum oxidation number 0 Maximum oxidation number 2 Minimum common oxidation number 0 Maximum common oxidation number 2
Back to the top
Appearance & Characteristics Structure fcc: face-centered cubic Color colorless Uses lamps, UV-laser Toxicity no Hardness mohs Characteristics unreactive
Reactions Reaction with air none Reaction with 6M HCl none Reaction with 6M HCl none Reaction with 15M HNO3 none Reaction with 6M NaOH none
Back to the top
Other Forms Number of isotopes 6 Hydride(s) none Oxide(s) none Chloride(s) none
Abundance Source Air Rel. abund. solar system 1.653 log Abundance earth's crust -4 log Cost, pure 33 $/100g Cost, bulk $/100g
Back to the top
History:
(Gr. kryptos, hidden) Discovered in 1898 by Ramsay and Travers in the residue left after liquid air had nearly boiled away. Krypton is present in the air to the extent of about 1 ppm. The atmosphere of Mars has been found to contain 0.3 ppm of krypton. It is one of the "noble" gases. It is characterized by its brilliant green and orange spectral lines. Naturally occurring krypton contains six stable isotopes. Seventeen other unstable isotopes are now recognized. The spectral lines of krypton are easily produced and some are very sharp. In 1960 it was internationally agreed that the fundamental unit of length, the meter, should be defined in terms of the orange-red spectral line of 86Kr. This replaced the standard meter of Paris, which was defined in terms of a bar made of a platinum-iridium alloy. In October 1983 the meter, which originally was defined as being one ten millionth of a quadrant of the earth's polar circumference, was again redefined by the International Bureau of Weights and Measures as being the length of a path traveled by light in a vacuum during a time interval of 1/299,792,458 of a second. Solid krypton is a white crystalline substance with a face-centered cubic structure which is common to all the "rare gases." While krypton is generally thought of as a rare gas that normally does not combine with other elements to form compounds, it now appears that the existence of some krypton compounds is established. Krypton difluoride has been prepared in gram quantities and can be made by several methods. A higher fluoride of krypton and a salt of an oxyacid of krypton also have been reported. Molecule-ions of ArKr+ and KrH+ have been identified and investigated, and evidence is provided for the formation of KrXe or KrXe+. Krypton clathrates have been prepared with hydroquinone and phenol. 85Kr has found recent application in chemical analysis. By imbedding the isotope in various solids, kryptonates are formed. The activity of these kryptonates is sensitive to chemical reactions at the surface. Estimates of the concentration of reactants are therefore made possible. Krypton is used in certain photographic flash lamps for high-speed photography. Uses thus far have been limited because of its high cost. Krypton gas presently costs about $30/l. Back to the top
The essentials Name: krypton Symbol: Kr Atomic number: 36 Atomic weight: 83.798 (2) g m CAS Registry ID: 7439-90-9 Group number: 18 Group name: Noble gas Period number: 4 Block: p-block
LOL SBV when did u become darkbolt?<!--emo&???--><img src='http://www.unknownworlds.com/forums/html/emoticons/confused.gif' border='0' style='vertical-align:middle' alt='confused.gif'><!--endemo-->
Dark u gonna post ya question or what <!--emo&???--><img src='http://www.unknownworlds.com/forums/html/emoticons/confused.gif' border='0' style='vertical-align:middle' alt='confused.gif'><!--endemo--><!--emo&???--><img src='http://www.unknownworlds.com/forums/html/emoticons/confused.gif' border='0' style='vertical-align:middle' alt='confused.gif'><!--endemo--><!--emo&???--><img src='http://www.unknownworlds.com/forums/html/emoticons/confused.gif' border='0' style='vertical-align:middle' alt='confused.gif'><!--endemo-->?
SBV: var pts = []; var m = (p2y-p1y)/(p2x-p1x); var b = p1y - p1x * m; for (var i=0; i < n; i++) { var x = p1x + ((p2x-p1x)/n) * i; pts.push({x:x, y:m*x+b}); if (i > 0) { pts[i].r = Math.rotation(pts[i].y-pts[(i-1)].y, pts[i].x-pts[(i-1)].x);
I could be wrong on that one.
Jasp: That 34 barrel thing on metalstorm.com that fires a million rounds per minute.
<!--QuoteBegin--dr.d+Jul 2 2003, 06:21 PM--></span><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td><b>QUOTE</b> (dr.d @ Jul 2 2003, 06:21 PM)</td></tr><tr><td id='QUOTE'><!--QuoteEBegin--> SBV: var pts = []; var m = (p2y-p1y)/(p2x-p1x); var b = p1y - p1x * m; for (var i=0; i < n; i++) { var x = p1x + ((p2x-p1x)/n) * i; pts.push({x:x, y:m*x+b}); if (i > 0) { pts[i].r = Math.rotation(pts[i].y-pts[(i-1)].y, pts[i].x-pts[(i-1)].x);
I could be wrong on that one.
Jasp: That 34 barrel thing on metalstorm.com that fires a million rounds per minute. <!--QuoteEnd--> </td></tr></table><span class='postcolor'> <!--QuoteEEnd--> Ok... WTH did you just write...
Something to do with co-ordinates.. Anyway, thats wrong.
Comments
Anyway who discovered the element Krypton and where was it located on the original table of elements?
SBV: I like good rap but mostly techno and yes I am too smart : P
"We jumped over a sea of instability onto an island of stability that theories have been predicting since the 1970s," said nuclear physicist Victor Ninov who was first author of a paper that has been submitted to Physical Review Letters.
Said Ken Gregorich, a nuclear chemist who led the discovery team, "We were able to produce these superheavies using a reaction that, until a few months ago, we had not considered using. However, theoretician Robert Smolanczuk (a visiting Fulbright scholar from the Soltan Institute for Nuclear Studies in Poland) calculated that this reaction should have particularly favorable production rates. Our unexpected success in producing these superheavy elements opens up a whole world of possibilities using similar reactions: new elements and isotopes, tests of nuclear stability and mass models, and a new understanding of nuclear reactions for the production of heavy elements."
Gregorich and Ninov are members of Berkeley Lab's Nuclear Science Division (NSD). Walter Loveland, on sabbatical from Oregon State University, also made major contributions to this work. Other participants from the NSD included long-time leaders in the search for superheavy elements Albert Ghiorso and Darleane Hoffman, plus Diana Lee, Heino Nitsche, Wladyslaw Swiatecki, Uwe Kirbach, Carola Laue, and graduate students from the University of California at Berkeley Jeb Adams, Joshua Patin, Dawn Shaughnessy, Dan Strellis, and Philip Wilk. Hoffman and Nitsche are also professors of chemistry at UC Berkeley.
Noting that four members of the discovery team are German citizens, U.S. Secretary of Energy Bill Richardson, whose department funded this work said, "This stunning discovery which opens the door to further insights into the structure of the atomic nucleus also underscores the value of foreign visitors and what the country would lose if there were a moratorium on foreign visitors at our national labs. Scientific excellence doesn't recognize national boundaries, and we will damage our ability to perform world-class science if we cut off our laboratories from the rest of the world."
The isotope of element 118 with mass number 293 identified at Berkeley Lab contains 118 protons and 175 neutrons in its nucleus. By comparison, the heaviest element found in Nature in sizeable quantities is uranium which, in its most common form, contains 92 protons and 146 neutrons. Transuranic elements in the periodic table can only be synthesized in nuclear reactors or particle accelerators. Though often short-lived, these artificial elements provide scientists with valuable insights into the structure of atomic nuclei and offer opportunities to study the chemical properties of the heaviest elements beyond uranium.
Within less than a millisecond after its creation, the element 118 nucleus decays by emitting an alpha particle, leaving behind an isotope of element 116 with mass number 289, containing 116 protons and 173 neutrons. This daughter, element-116, is also radioactive, alpha-decaying to an isotope of element 114. The chain of successive alpha decays continues until at least element 106.
"In these experiments, observation of a chain of six high-energy alpha decays within about one second unambiguously signaled the production and decay of element 118," says Gregorich. "During 11 days of experiments, three such alpha-decay chains were observed indicating production of three atoms of element 118. The decay energies and lifetimes measured for these new isotopes of elements 118, 116, 114, 112, 110, 108, and 106 provide strong support for the existence of the predicted island of stability."
Referring to these results, discovery-team member Hoffman said, "After a 30-year search, this discovery is extremely gratifying. I only wish Glenn Seaborg had been alive to see these results." Seaborg, the recently deceased Nobel laureate chemist and co-discoverer of plutonium and nine other transuranic elements, was one of the earliest and most outspoken advocates of experiments to reach the predicted island of stability.
Elements 118 and 116 were discovered by accelerating a beam of krypton-86 ions to an energy of 449 million electron volts and directing the beam into targets of lead-208. This yielded heavy compound nuclei at low excitation energies.
During the last several years, low excitation energy reactions failed to take scientists beyond element 112, and it was assumed that production rates for heavier elements were too small to extend the periodic table further using this approach. However, the recent calculations of Smolanczuk indicating increased production rates for the Kr-86 + Pb-208 reaction prompted the experimental search for element 118 at Berkeley Lab.
The key to the success of this experiment was the newly constructed Berkeley Gas-filled Separator (BGS). Said Gregorich, "The innovative BGS design has resulted in a separator with unsurpassed efficiency and background suppression which allows us to investigate nuclear reactions with production rates smaller than one atom per week. For these experiments, the strong magnetic fields in the BGS focused the element 118 ions and separated them from all of the interfering reaction products which were produced in much larger quantities."
Another important factor for the experiment's success was the unique ability of the 88-Inch Cyclotron to accelerate neutron-rich isotopes such as krypton-86 to high-energy and high-intensity beams with an average current of approximately 2 trillion ions per second.
"The 88-inch Cyclotron is the only accelerator in the United States at this time that can provide krypton beams at the intensities that this experiment demanded," said Claude Lyneis, the NSD physicist who heads the accelerator facility for Berkeley Lab.
In operation since 1961, the 88-inch Cyclotron has been upgraded with the addition of a high-performance ion sources and can now accelerate beams of ions as light as hydrogen or as heavy as uranium. The 88-Inch Cyclotron is a national user facility serving researchers from around the world for basic and applied studies.
Said I-Yang Lee, scientific director at the 88-Inch Cyclotron, "From the discovery of these two new superheavy elements, it is now clear that the island of stability can be reached. Additionally, similar reactions can be used to produce other elements and isotopes, providing a rich new region for the study of nuclear and even chemical properties."
Berkeley Lab is a U.S. Department of Energy national laboratory located in Berkeley, California. It conducts unclassified scientific research and is managed by the University of California.
*do i win yet*
Atomic number 36 Atomic weight 83.80
Density @ 293 K 0.003708 g/cm3 Atomic volume 38.9 cm3/mol
Group Noble Gas Discovered 1898
States
State (s, l, g) g
Melting point 116.6 K Boiling point 119.7 K
Heat of fusion 1.638 kJ/mol Heat of vaporization 9.029 kJ/mol
Back to the top
Energies
1st ionization energy 1350.7 kJ/mole Electronegativity 3
2nd ionization energy 2350.3 kJ/mole Electron affinity kJ/mole
3rd ionization energy 3565.1 kJ/mole Specific heat 0.248 J/gK
Heat atomization 0 kJ/mole atoms
Oxidation & Electrons
Shells 2,8,18,8 Electron configuration [Ar] 3d10 4s2 4p6
Minimum oxidation number 0 Maximum oxidation number 2
Minimum common oxidation number 0 Maximum common oxidation number 2
Back to the top
Appearance & Characteristics
Structure fcc: face-centered cubic Color colorless
Uses lamps, UV-laser Toxicity no
Hardness mohs Characteristics unreactive
Reactions
Reaction with air none Reaction with 6M HCl none
Reaction with 6M HCl none Reaction with 15M HNO3 none
Reaction with 6M NaOH none
Back to the top
Other Forms
Number of isotopes 6 Hydride(s) none
Oxide(s) none Chloride(s) none
Radius
Ionic radius (2- ion) pm Ionic radius (1- ion) pm
Atomic radius 112 pm Ionic radius (1+ ion) pm
Ionic radius (2+ ion) pm Ionic radius (3+ ion) pm
Back to the top
Conductivity
Thermal conductivity 0.01 J/m-sec-deg Electrical conductivity 0 1/mohm-cm
Polarizability 2.5 A^3
Abundance
Source Air Rel. abund. solar system 1.653 log
Abundance earth's crust -4 log Cost, pure 33 $/100g
Cost, bulk $/100g
Back to the top
History:
(Gr. kryptos, hidden) Discovered in 1898 by Ramsay and Travers in the residue left after liquid air had nearly boiled away. Krypton is present in the air to the extent of about 1 ppm. The atmosphere of Mars has been found to contain 0.3 ppm of krypton. It is one of the "noble" gases. It is characterized by its brilliant green and orange spectral lines. Naturally occurring krypton contains six stable isotopes. Seventeen other unstable isotopes are now recognized. The spectral lines of krypton are easily produced and some are very sharp. In 1960 it was internationally agreed that the fundamental unit of length, the meter, should be defined in terms of the orange-red spectral line of 86Kr. This replaced the standard meter of Paris, which was defined in terms of a bar made of a platinum-iridium alloy. In October 1983 the meter, which originally was defined as being one ten millionth of a quadrant of the earth's polar circumference, was again redefined by the International Bureau of Weights and Measures as being the length of a path traveled by light in a vacuum during a time interval of 1/299,792,458 of a second. Solid krypton is a white crystalline substance with a face-centered cubic structure which is common to all the "rare gases." While krypton is generally thought of as a rare gas that normally does not combine with other elements to form compounds, it now appears that the existence of some krypton compounds is established. Krypton difluoride has been prepared in gram quantities and can be made by several methods. A higher fluoride of krypton and a salt of an oxyacid of krypton also have been reported. Molecule-ions of ArKr+ and KrH+ have been identified and investigated, and evidence is provided for the formation of KrXe or KrXe+. Krypton clathrates have been prepared with hydroquinone and phenol. 85Kr has found recent application in chemical analysis. By imbedding the isotope in various solids, kryptonates are formed. The activity of these kryptonates is sensitive to chemical reactions at the surface. Estimates of the concentration of reactants are therefore made possible. Krypton is used in certain photographic flash lamps for high-speed photography. Uses thus far have been limited because of its high cost. Krypton gas presently costs about $30/l.
Back to the top
Pifff mine is better lol
The essentials
Name: krypton
Symbol: Kr
Atomic number: 36
Atomic weight: 83.798 (2) g m
CAS Registry ID: 7439-90-9
Group number: 18
Group name: Noble gas
Period number: 4
Block: p-block
Heres an easy one:
Whats the action script for stopping on a certain frame in a Flash movie?
Dark u gonna post ya question or what <!--emo&???--><img src='http://www.unknownworlds.com/forums/html/emoticons/confused.gif' border='0' style='vertical-align:middle' alt='confused.gif'><!--endemo--><!--emo&???--><img src='http://www.unknownworlds.com/forums/html/emoticons/confused.gif' border='0' style='vertical-align:middle' alt='confused.gif'><!--endemo--><!--emo&???--><img src='http://www.unknownworlds.com/forums/html/emoticons/confused.gif' border='0' style='vertical-align:middle' alt='confused.gif'><!--endemo-->?
*you dont have to spread thoughts out over 5 posts, there IS an edit button*
ok ok a question
Whats the fastest fireing machine gun ? (note i did post this somewere before)
did i do something wrong
How do you stop a frame in Flash MX.
var m = (p2y-p1y)/(p2x-p1x);
var b = p1y - p1x * m;
for (var i=0; i < n; i++) {
var x = p1x + ((p2x-p1x)/n) * i;
pts.push({x:x, y:m*x+b});
if (i > 0) {
pts[i].r = Math.rotation(pts[i].y-pts[(i-1)].y,
pts[i].x-pts[(i-1)].x);
I could be wrong on that one.
Jasp: That 34 barrel thing on metalstorm.com that fires a million rounds per minute.
Mini admins go on all new threads as thier admins after all lol and have to maintain em.
heres my question
What is the 2nd highest form that one can evolve to on these forums.
var m = (p2y-p1y)/(p2x-p1x);
var b = p1y - p1x * m;
for (var i=0; i < n; i++) {
var x = p1x + ((p2x-p1x)/n) * i;
pts.push({x:x, y:m*x+b});
if (i > 0) {
pts[i].r = Math.rotation(pts[i].y-pts[(i-1)].y,
pts[i].x-pts[(i-1)].x);
I could be wrong on that one.
Jasp: That 34 barrel thing on metalstorm.com that fires a million rounds per minute. <!--QuoteEnd--> </td></tr></table><span class='postcolor'> <!--QuoteEEnd-->
Ok... WTH did you just write...
Something to do with co-ordinates.. Anyway, thats wrong.
i cant find the anwser
i give up on this one
Hercules in New York I believe....
Am I right?
Edit: Jasp did answer it n/m he just didn't give a title.