What is meant by size of nucleus? do all nuclei are of same size?

Explanation

The very small central core of an atom where whole of its positive charge and entire mass is concentrated is known as nucleus. All the nuclei are not pf same size because radius of nucleus `(R) prop A^(1//3)`. where A is the mass number. As mass number of different atoms or nuclei is different. `therefore` Size of their nuclei is also different.