Question

19. The mass number and atomic number of an element is $23$ and $11$ respectively. What is the number of nucleons present in it?

Answer 1

1. Proton number and atomic number of an atom are the same.
2. $\mathrm{Mass}\mathrm{number}=\mathrm{Number}\mathrm{of}\mathrm{protons}+\mathrm{Number}\mathrm{of}\mathrm{neutrons}$
3. Nucleons are the protons and neutrons.
4. $\mathrm{Mass}\mathrm{number}=\mathrm{Nucleons}=23$

Therefore, number of nucleons is 23.