HYDROGEN NOTE BY AAKASH INSTITUTE

Hydrogen is the most considerable element in universe and 1/3 maximum considerable element on the surface of earth. It's far the best element with handiest one electron in its orbit around the nucleus congaing only one proton. It exist as a diatomic molecule i.E. H2 in its elemental form. The global difficulty related to smooth energy makes it so crucial to examine hydrogen one at a time from the other elements. 

This difficulty may be triumph over to a extra extent by using using hydrogen as a supply of electricity. Hydrogen is the primary element of periodic desk but its role inside the periodic desk has been a subject of dialogue for the beyond few years because of its similarities with each halogens and alkali metals. A proper role could not be assigned to hydrogen both within the Mendeleev’s periodic table or modern periodic desk due to the subsequent cause.

In a few homes, it resembles alkali metals and in some homes it resembles halogens. So hydrogen may be located each in group 1 and organization 17 with alkali metals and halogen respectively.   Ionization enthalpy  : Ionization enthalpy of hydrogen (1312 kJ mol-1) could be very excessive in evaluation with the ionization enthalpy of alkali metals. 2. Life of H-  : it has been installed that H-  ion does now not exist freely in a aqueous solution.


This is due to the fact that has a very small size compared to everyday atomic and ionic length (which variety from 50 to 220 pm). As a consequence it exists in aqueous answer inside the form of hydrated proton with a formulation,H9O4-. However, for the sake of simplicity hydrated proton is represented through hydronium ion,H3O+.On the other hand, the alkali steel ions typically exist as hexahydrated ions.3. Distinction in halides.

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Hydrogen halides are different from the halides of alkali metals despite the fact that they have got comparable molecular formulae. As an example(i) pure HCl is a covalent compound even as NaCl is an ionic compound.(ii) HCl is a gaseous compound at the same time as NaCl is a stable at normal temperature.

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