Hydrogen,most abundant element in the universe and the third most abundant on the surface of the globe,is being visualised as the major future source of ENERGY. Position of hydrogen in the periodic table: Hydrogen is first element in the periodic table. It has electronic configuration 1S1. its electronic configuration is similar to the outer electron electronic configuration of alkali metals (ns1). Hydrogen forms oxide , halides and sulphides It has very high ionization enthalpy. Mostly hydrogen exist as a dihydrogen in the universe . Dihydrogen H2: dihydrogen is the most abundant element in the universe (70% the total mass of the universe) . Isotopes of Hydrogen : Hydrogen has three isotopes : 1.protium 1H1 in this neutron is absent. 2. Deuterium, 2H1 or D 3. Tritium, 3H1. 0r T . These isotopes different form oneanother in respect of their presence of neutrons. Out of these Tritium shows radioactivity. Which emits low energy beta particles . Nat
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