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HYDROGEN - NCERT
284 CHEMISTRYUNIT 9 After studying this unit , you will beable to present informed opinions on theposition of HYDROGEN in theperiodic table; identify the modes of occurrenceand preparation of dihydrogen ona small and commercial scale;describe isotopes of HYDROGEN ; explain how different elementscombine with HYDROGEN to formionic, molecular and non-stoichiometric compounds; describe how an understanding ofits properties can lead to theproduction of useful substances,and new technologies; understand the structure of waterand use the knowledge forexplaining physical and chemicalproperties; explain how environmental waterquality depends on a variety ofdissolved substances; differencebetween 'hard' and 'soft' water andlearn about water softening; acquire the knowledge aboutheavy water and its importance; understand the structure ofhydrogen peroxide, learn itspreparatory methods andproperties leading to themanufacture of useful chemicalsand cleaning of environment; understand and use certain , electron-deficient, electron-precise, electron-rich, hydrogeneconomy, hydrogenation , the m
periodic table (Unit 3). 9.2 DIHYDROGEN, H 2 9.2.1 Occurrence Dihydrogen is the most abundant element in the universe (70% of the total mass of the universe) and is the principal element in the Property Hydrogen Deuterium Tritium Relative abundance (%) 99.985 0.0156 10–15 Relative atomic mass (g mol–1) 1.008 2.014 3.016
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