Sub-atomic Particles and Isotopes

2023 1 question

1. 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 $9.10939\times10^{-31}$ 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: