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The radius of a shell for H-atom is 4.761A°. The value of n is:-

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Important Questions on Structure of Atom

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In Bohr's atomic model radius of nth orbit of hydrogen is 0.053 nm then radius of 3rd  orbit of Li+2 is:
 
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For any H like system, the ratio of velocities of I, II & III orbit i.e., V1 : V2: V3 will be:

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The energy of hydrogen atom in nth orbit is En, then the energy in nth orbit of singly ionised helium atom will be:
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The energy of second Bohr orbit of the hydrogen atom is -328kJ/mol. Hence the energy of fourth Bohr orbit should be :
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The ratio between kinetic energy and the total energy of the electron of hydrogen atom according to Bohr's model is :-
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Maximum frequency of emission is obtained for the transition :-
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If the ionization energy of hydrogen is 313.8 kcal per mole, then the energy of the electron in the 2nd  excited state will be :-
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Which of the following electron transition will require the largest amount of energy in a hydrogen atom: