DEDUCTION OF THE ELECTRONIC CONFIGURATION OF AN ELEMENT FROM THE DATA OF SUCCESSIVE IONISATION ENERGIES

 

Borrow involves the removal electron from 25 and 2psubshells respectively. Since 2p subshell  has slightly more energy than2s subshell, hence has energy is required to remove an electron fromborrow

  (b)First I.E drop from nitrogen to oxygen:

                       There is another drop in first I.E from nitrogen to oxygen.

1v

1

1

1

1v

 

            ₇N =

                       15         25                    2p

1

1v

1v

1

1

           

₈O =

                         15         25                    2p

 

            The 2p shell is half filled in nitrogen. However, pairing electrons occur in oxygen. In Pair overall energy of the orbital is more than orbital with single electron because in pair repulsion increase the energy level of orbital as a result ionization energy decreases. Similarly drop in 1^st I.E. is observe from Mg to al and fro P to S due same reasons in third period successively from one mole of gaseous atom or ions of an element.

 EXPLANATION:

             If one mole of gaseous atoms are supplies with sufficient amount of energy which is required for the first additional supply of energy with result in the successive ionization of second, third, fourth and soon electrons starting from valence shell to the lower shells if we plot a graph between successive ionization energies if an element along y-axis against number of electrons revolved along x-axis. The pattern on the graph or difference in successive ionization energies is helpful for predicting or confirming the electronic configuration of an electron. This pattern is also helpful to confirm the number of electrons in the outer shell which leads to confirm the position of the element in the periodic table.

 DEDUCTION OF THE ELECTRONIC CONFIGURATION OF AN ELEMENT FROM THE DATA OF SUCCESSIVE IONISATION ENERGIES:

             From the given data of successive ionization energies one can deduce the electronic configuration of an element e.g; Data for successive ionization energies of Beryllium is given below: