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 itsprepara

HYDROGEN 285 possess metallic characteristics under normal conditions. In fact, in terms of ionization enthalpy, hydrogen resembles more with halogens, ∆i H of Li is 520 kJ mol –1, F is 1680 kJ mol–1 and that of H is 1312 kJ mol–1. Like halogens, it forms a diatomic molecule,

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