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| Borderline personality disorder and promiscuity | 3 days ago · Due to the complexity and heterogeneity of tumors, the therapeutic effectiveness of monomodal phototherapy is still limited. As aggressive tumors beco. Apr 12, · In alkali metal oxides, both of the bonds of the dioxygen molecule first undergoes homolytic cleavage, then the nascent oxygen gets two electrons from two metal atoms. In alkali metal peroxides, one bond of dioxygen molecule undergoes homolytic cleavage and this results in formation of O-O with one unpaired electron on each oxygen then 2 metal. Electronegativity, symbolized as χ, is the tendency of an atom to attract shared electrons (or electron density) to itself. An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus. The higher the associated electronegativity, the more an atom or a substituent group attracts electrons. |
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Thank you for visiting nature. You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. Using a custom atomic force microscope equipped with an integrated X-ray source, transformation of potassium bromide surfaces to potassium nitrate by air radiolysis species was followed directly in situ at the nanoscale. Radiolysis initiates dynamic step edge dissolution, surface composition evolution, and ultimately nucleation and heteroepitaxial growth of potassium nitrate crystallites mediated by surface diffusion at rates controlled by adsorbed water. In contrast to in situ electron microscopy and synchrotron-based imaging techniques where high radiation doses are intrinsic, our approach illustrates the value of decoupling irradiation and the basis of observation. Reactions induced by ionizing radiation at material interfaces are important in many fields including atmospheric chemistry 1 , 2 , 3 , nuclear reactor material design, radioactive waste repositories 4 , 5 , 6 , dosimetry 7 , medical devices 8 , 9 , and space science engineering Fundamental understanding of these systems often benefits from direct detailed observations under in situ irradiation conditions in real-time to be able to infer impacts over larger spatial and temporal scales 9 , alkali metals video.Alkali metals video Video
Alkali metals:brainiac, open university and Francium clips
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