Structure of At...

Which one of the following is the correct order of energies of 3p, 3d, 4s and 4p orbitals as per Aufbau principle ?

Which electron,orbitals are designated by
(i) n= 2, l=1, m= 0;
(ii)n= 3, l= 2, m= 0;
(iii)n = 4, l = 2, m = 1 and
(iv) n = 5, I= 3, m =3 respectively ?

The maximum number of electrons in any shell is given by____ rule.

The Ionisation potential of Hydrogen is $$2.17\times 10^{-11}erg/ atom$$. The energy of the electron in the second orbit of the hydrogen atom is?

In Bohr series of lines of hydrogen spectrum, the third line from the red corresponds to which one of the following inter-orbit jumps of the electron for Bohr orbits in an atom of hydrogen?

Which of the following electronic configuration is not possible?

The energy levels for $$_{Z}A^{(+Z - 1)}$$ can be given by:

The electrons, identified by quantum numbers $$n$$ and $$l$$ (i) $$n=4,l=1$$, (ii) $$n=4,l=0$$  (iii) $$n=3,l=2$$  (iv)  $$n=3,l=1$$ can be place in order of increasing energy, from the lowest to highest, as:

A certain negative ion $${X}^{2-}$$ has in its nucleus $$18$$ neutrons and $$18$$ electrons in its extra nuclear structure. What is the mass number of $$X$$?

A photon of energy 12.75 ev is completely absorbed by a hydrogen atom initially In ground state. The principle quantum number of the excited state is