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 most abundant element in the universe and thethird most abundant on the surface of the globe, is beingvisualised as the major future source of has the simplest atomic structure among all theelements around us in Nature.

carbohydrates, proteins, hydrides including hydrocarbons and many other compounds. 9.2.2 Isotopes of Hydrogen Hydrogen has three isotopes: protium, 1 1H, deuterium, 2 1H or D and tritium, 3 1H or T. Can you guess how these isotopes differ from each other ? These isotopes differ from one another in respect of the presence of neutrons. Ordinary

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