Structure of At...

In an atom the order of increasing energy of electrons with quantum numbers.
i) $$n=4,l=1$$                ii) $$n=3,l=2$$              iii) $$n=3,l=1$$                   iv) $$n=4,l=0$$

Which principle/ rule limits the maximum number of electrons in orbital to two?

Find an expression for de Broglie wavelength for an electron in the $$n^{th}$$ orbit of the Bohr model of the hydrogen atom and hence find its value when the electron is in n = 4 level.
Take radius of nth orbital of Bohr's model of H-atom; $$r_n = (53 \ n^2) $$ pm

An electron jumps from the $$4^{th}$$ orbit to the $$2^{nd}$$ orbit of hydrogen atom $$(R=10^{5}\ Cm^{-1})$$. Frequency is in $$Hz$$ of emitted radiation will be

For a nucleus to be stable, the correct relation between neutron number N and proton number Z is 

Which of the following radiations has largest energy ?

According to Bohr's theory of the hydrogen atom, the speed $$v_n$$ of the electron in a stationary orbit is related to the principal quantum number n as (C is a constant).

Atomic number of $$N$$ is $$7$$. The atomic number of 3rd member of nitrogen family is 

In a hypothetical system a particle of mass m and charge -3 q is moving around a very heavy particle having charge q. Assuming Bohr's model to be true to this system, the orbital velocity of mass m when it is nearest to heavy particle is:

Three photons originating from exited atomic hydrogen atoms are found to have energies of 0.66 eV, 1.89 eV and 2.55 eV respectively. The minimum no. of atoms that must be present are :