Conclusions made from energy expression observations are as follows 1 As we go away from nucleus energy of shell goes on increasing this means energy of electron present in that shell goes on increasing Increase in energy means force of attraction goes on decreasing ii iii At infinity E is zero this means there is no force of attraction between electron and nucleus c Electron revolves only in those orbits whose angular momentum mvr is an integral multiple of the factor 2 where his Planck s constant h 2n myr n where m is the mass of the electron v the velocity of the electron n the number of orbit in which electron revolves that is n 1 2 3 and r the radius of the orbit d As long as the electron occupies a definite energy level it does not radiate out energy that is it does not lose or gain energy Excited State of Electron As long as e is in particular state It neither loses energy nor gains energy of its own If an e wants to go from lower to higher state it will have to absorb energy equal to the difference in the energy of two shells On absorbing energy electron goes to the excited state So electrons present in the ground state are called absorbers and those that emit energies are called emitters e present in ground state can only behave as absorber Nucleus a Energy absorbed E E Note This a differenc Concept Concep 11 n Note To Formi Note i IE of MATHE POSTU Calcu