Mass Defect
The mass of the nucleus is always less than the sum of the masses of nucleons composing the nucleus. The difference between the rest mass of the nucleus and the sum of the rest masses of nucleons constituting the nucleus is known as mass defect.
△m = [Zmp +(A-Z)mn] – M(ZXA)
where,
mp = mass of protons
Z = Atomic number
A = Mass number
Structure of Nucleus
The nucleus of an atom consists of two types of particles, positively charged particles called protons and neutrally charged particles called neutrons. Protons + Neutrons in an atom represent the nucleus of an atom. The nucleus of an atom is represented by ZXA, where X is the nucleus of an atom, Z is the atomic number and A is the mass number.
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