Size of the Nucleus
Rutherford assumed the distance of the closest approach as a measure of the size of an atomic nucleus. Assuming, the nuclei are spherical, the relation between the radius of the nucleus and the mass number is given by:
R = R0A1/3
where,
R0 is constant
For electrons R0 = 1.25×10-15m = 1.25 fermi(fm)
The Radius R of a nucleus is proportional to the cube root of its 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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