Draw the variation of binding energy per nuvcleon with mass number of atoms and indicate the stable an unstable regions of the diagram.

Draw the curve showing the variation of binding energy per nucleon as a function of mass number A. Explain the stability of the nucleus from the curve .

Draw the curve showing the variation of binding energy per nucleon as a function of mass number A. Explain the stability of the nucleus from the curve.

Draw the plot of binding energy per nucleon (B.E./A) as a function of mass number A. Write two important conclusions that can drawn regarding the nature of nuclear force.

A flask contains Argon and chloring in the ratio of 2:1 by mass. The temperature of the mixture is 27^@C Obtain the ratio of averagae kinetic energy per molecule and root mean square speed v_(rms) of the molecules of the two gases. Given atomic mass of argon=39.9 u and molarcular mass of chlorine.=70.9 u.

Calculate the mass defect and binding energy per nucleon for "_(27) Co^(59) . [The mass of Co^(59)= 58,95 amu, mass of hydrogen atom = 1.008742 amu and mass of neutron 1.008982 amu]

Will there the regular variations in the energy associated with successive principal quantum numbers of hydrogen-like atoms?

Alkali metals on combustion in excess of air form different type of oxides depending on the size of metal cations e.g . lithium forms mainly the oxide Li_2O , sodium forms peroxide and some super oxides NaO_2 and potassium, Rubidium and caesium form the superoxides, MO_2 . The stability of peroxide and superoxide increases, as the size of the metal cation increases because of the stabilisation of larger anion by larger cations through lattice energy effect. These oxides are easily hydrolysed by water. The oxides and the peroxides are colourless when pure, but the superoxides are yellow or orange in colour. Peroxide and superoxide of sodium and potassium are widely used as oxidising agent and as air purifier in space capsules, submarines and breathing mask. When sodium reacts with excess of oxygen at 350^@ C , the oxidation number of oxygen per atom changes from: