binding energy for caesium atom

to find the binding energy per nucleon on cesium atom or nuclei, we start by finding te difference between the actual mass and the measured mass, the actual mass can be calculated as follows.

it has atomic mass of 133, 55 protons and 78 neutrons

 the actual mass is given by

55 x 1.007825 + 78 x 1.008665 =134.1

measured mass  is 132.905447

mass defect is 1.2 amu

 the binding energy is therefore = 1.2 amu x (3 x 10⁸)² =10.807182 x 10¹⁰Joules

and the binding energy per nucleon is given as

8.1257 x 10¹⁴ Joules