atomic structure Questions

Select the correct statements from the following:A. Atoms of all elements are composed of two fundamental particles.B. The mass of the electron is $9.10939\times 10^{-31}\text{kg}$.C. All the isotopes of a given element show same chemical properties.D. Protons and electrons are, collectively known as nucleons.E. Dalton's atomic theory, regarded the atom as an ultimate particle of matter.Choose the correct answer from the options given below:

The relation between $n_m$ ($n_m=$ the number of permissible values of magnetic quantum number ($m$)) for a given value of azimuthal quantum number ($l$), is: