#BA2 Question Answers

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Atomic radius of o

The reason for this is the repulsion of electrons is more in case of oxygen. The ionic radii of O2 (1.32 ) and Ba2+ (1.34 ) are almost the same. The electronic configuration of nitrogen is $2$. This structure is best understood in terms of the sizes of the atoms involved. Thus, the atomic radius oxygen should be less than that of nitrogen.īut the atomic radius of oxygen is slightly more than that of nitrogen. The melting point of beryllium is 1551.15 degrees Kelvin or 1279 degrees Celsius or degrees Celsius. Beryllium is a white-gray metallic chemical element and belongs to the group of alkaline earth metals. Largest radius Smallest radius Answer Bank Ar Si Mg Al Na Arrange the elements according to atomic. By this definition, the atomic number of oxygen is slightly more than that of nitrogen.Īs we move from left to right in the periodic table, the atomic radius of elements keeps on decreasing. The state of beryllium in its natural form is solid (diamagnetic). Question: Arrange the elements according to atomic radius. In the periodic table, the elements are arranged in the increasing order of their atomic numbers.Īs we move from left to right in the periodic table, the atomic number of the elements increases. The elements given to us are oxygen and nitrogen. o The further the valence electron shell is from the nucleus of an atom. The atomic radius increases down the group. electronegativity, ionization energy, electron affinity, atomic radius. The trend in atomic radius is as follows: The atomic radius decreases from left to right across the period. Here, zeolites prime concern is to catalytic activity. double explosion-affected people), nine of whom claimed to be in the blast zone in both cities. Atomic radius is important in the crystal structure prediction. The Doubly Atomic Bombed of Hiroshima and Nagasaki documented 165 nij hibakusha (lit. The distance from the centre of the nucleus to the point up to which the density of the electron cloud is maximum. There are some small exceptions, such as the oxygen radius being slightly greater than the nitrogen radius. The distance from the centre of the nucleus to the outermost shell containing electrons. In general, the atomic radius decreases as we move from left to right in a period, and it increases when we go down a group. Hint:The distance from the centre of the nucleus of the atom to the boundary of the shells is known as the atomic radius. The radius of total destruction was about 1.6 km (1 mi), followed by fires across the northern portion of the city to 3.2 km. Atomic radius is half the distance between adjacent atoms of the same element in a molecule.

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A blue spark to shine on the origin of the Universe An interdisciplinary team of scientists has demonstrated that it is possible to build an ultra-sensitive sensor based on a new fluorescent molecule able to detect the nuclear decay key to knowing whether or not a neutrino is its own antiparticle Why is our Universe made of matter? Why does everything exist as we know it? These questions are linked to one of the most important unsolved problems in particle physics. This problem is that of the nature of the neutrino, which could be its own antiparticle, as argued by the unfortunate Italian genius Ettore Majorana almost a century ago. If this were so, it could explain the mysterious cosmic asymmetry between matter and antimatter. Indeed, we know that the Universe is made almost exclusively of matter. However, the Big Bang theory predicts that the early Universe contained the same amount of matter and antimatter particles. This prediction is consistent with the "small Big Bangs" that form in proton collisions at CERN's giant LHC accelerator, where a symmetrical production of particles and antiparticles is always observed. So, where did the antimatter of the early Universe go? A possible mechanism points to the existence of heavy neutrinos that were its own antiparticle, and therefore, could decay into both matter and antimatter. If a second phenomenon occurs, called violation of charge and parity (that is, if the neutrino slightly favors in its decay the production of matter over that of antimatter), then it could have injected an excess of the first over the second. After all the matter and antimatter in the Universe were annihilated (with the exception of this small excess), the result would be a cosmos made only of matter, of the leftovers from the Big Bang. We could say that our Universe is the remnant of a shipwreck. It is possible to demonstrate that the neutrino is its own antiparticle by observing a rare type of nuclear process called neutrinoless double beta decay (bb0nu), in which concurrently two neutrons (n) of the nucleus are transformed into protons (p) while two electrons (e) are emitted out of the atom. This process can happen in some rare isotopes, such as Xenon-136, which has in its nucleus 54 p and 82 n, in addition to 54 e when is neutral. The NEXT experiment (directed by J.J. Gómez-Cadenas, DIPC and D. Nygren, UTA), located in the underground laboratory of Canfranc (LSC), looks for these decays using high pressure gas chambers. When a Xe-136 atom undergoes spontaneous bb0nu decay, the result of the process is the production of a doubly charged ion of Barium-136 (Ba2+); with 54 e and a nucleus made of 56 p and 80 n; and two electrons (Xe à Ba2+ + 2e). So far, the NEXT experiment has focused on observing these two electrons, whose signal is very characteristic of the process. However, the bb0nu process that is meant to be observed is extremely rare and the signal that is expected is of the order of one bb0nu decay per ton of gas and year of exposure. This very weak signal can be completely masked by background noise due to the ubiquitous natural radioactivity. However, if in addition to observing the two electrons, the barium ionized atom is also detected, the background noise can be reduced to zero, since natural radioactivity does not produce this ion. The problem is that observing a single ion of Ba2+ in the midst of a large bb0nu detector is technically so challenging that until recently it was considered essentially unfeasible. However, a number of recent works, the latest of which has just been published in the journal Nature, suggest that the feat may be feasible after all. The work, conceived and led by the researchers F.P. Cossío, Professor at the University of the Basque Country (UPV/EHU) and Scientific Director of Ikerbasque, and J.J. Gómez-Cadenas, Professor Ikerbasque at the Donostia International Physics Center (DIPC), includes an interdisciplinary team with scientists from DIPC, the UPV/EHU, Ikerbasque, the Optics Laboratory of the University of Murcia (LOUM), the Materials Physics Center (CFM, a joint center CSIC-UPV/EHU), POLYMAT, and the University of Texas at Arlington (UTA). Gómez-Cadenas has pointed out that "the result of this interdisciplinary collaboration that combines, among other disciplines, particle physics, organic chemistry, surface physics and optics, is a clear example of the commitment that DIPC has recently shown to developing new research lines. The purpose is not only to generate knowledge in other fields, different from the centre's usual ones, but also to look for hybrid grounds and create interdisciplinary projects that, in many cases, like this one, can be the most genuine". The research is based on the idea, proposed by one of the authors of the article, the prestigious scientist D. Nygren (inventor, among other devices of the Time Projection Chamber technology applied by many particle physics experiment, including NEXT). In 2016, Nygren proposed the feasibility to capture Ba2+ with a molecule capable of forming a supramolecular complex with it and to provide a clear signal when this occurs, thus yielding a suitable molecular indicator. Nygren and his group at UTA then went into designing "on-off" indicators, in which the signal of the molecule is highly enhanced when a supra-molecular complex is formed. The group led by Cossío and Gómez-Cadenas has followed a different path, designing a fluorescent bicolor indicator (FBI) which combines a large intensity enhancement and a dramatic color shift when the molecule captures Ba2+. The synthesis of FBI was done under the direction of DIPC researcher I. Rivilla. If an FBI molecule with no barium is illuminated with ultraviolet light, it emits fluorescence in the range of green light, with a narrow emission spectrum of about 550 nm. However, when this molecule captures Ba2+, its emission spectrum shifts towards blue (420 nm). The combination of both features results in a spectacular enhancement of the signal, thus making it very suitable for a future Ba2+ detector. It is interesting to note that the experimental multiphoton microscopy systems used in the LOUM by P. Artal's group for the green/blue spectral detection are based on those developed previously for imaging the cornea of the human eye in vivo. This is an example of interlacing the use of a unique technology in the world for biomedical applications on a fundamental problem of particle physics. "The effort to combine basic science and new instrumental implementations is essential to open new research avenues to answer the many questions that we scientists ask ourselves every day," says J.M. Bueno, Professor of Optics at LOUM. As Cossío has explained, "the most difficult task in the chemical part of the work was to design a new molecule that would meet the strict (almost impossible) requirements imposed by the NEXT experiment. This molecule had to be very bright, capture barium with extreme efficiency (bb0nu is a very rare event and no cation could be wasted) and emit a specific signal that would allow the capture to be detected without background noise. In addition, the chemical synthesis of the new FBI sensor had to be efficient in order to have enough ultra-pure samples for installation within the detector. The most rewarding part was to check that, after many efforts by this multidisciplinary team, actually our specific and ultra-sensitive FBI sensor worked as planned". Besides the design and characterization of FBI, the paper offers the first demonstration of the formation of a supramolecular complex in dry medium. This landmark result has been achieved preparing a layer of FBI indicators compressed over a silica pellet and evaporating over such a layer a salt of barium perchlorate. Z. Freixa, Ikerbasque Professor at the UPV/EHU says, with a smile: "the preparation of FBI on silica has been a quick-but-not-so-dirty solution for this proof of concept. A bit of home alchemy". The vacuum sublimation experiment was done by the CSIC scientist at CFM C. Rogero and her student P. Herrero-Gómez. Rogero, an expert in physics of surfaces says: "it was one of those Eureka moment, when we realized that we had in my lab just the tools to carry on the experiment. We evaporated the perchlorate and got FBI shinning in blue almost at the first attempt" The next step of this research project is the construction of an FBI based sensor for the detection of the neutrinoless double beta decay or bb0nu, for which Gomez-Cadenas, F. Monrabal from DIPC and D. Nygren and collaborators at UTA are developing a conceptual proposal. This work is a significant advance towards building a future "barium-tagging" NEXT experiment to look for noise-free bb0nu events through the identification of the two electrons and the barium atom produced in the reaction. This experiment would have a great potential to find out if the neutrino is its own antiparticle, which could lead to answer fundamental questions about the origin of the Universe. IMAGE....Artistic representation of the new fluorescent molecule that can shed light on the elusive nature of neutrinos. CREDIT UPV/EHU

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