Fill in the missing information in the following table.

What is the main difference between isotopes of the same element?

For the following statements, write T for True and F for False.

a. J.J. Thomson proposed that the nucleus of an atom contains only nucleons.

b. A neutron is formed by an electron and a proton combining together. Therefore, it is neutral.

c. The mass of an electron is 1/2000 times that of proton.

How do you appreciate the efforts made by scientists to explain the structure of atom by developing various atomic models?

Geeta got a doubt, "Why atomic nucleus contains proton and neutrons inside it? Why can't electrons and neutrons?" Can you help to clarify her doubt? Explain.