Sudheer said that the fundamental particles named ‘X’ are revolved around the nucleus and suresh said there are another type of fundamental particles with +ve charge ‘Y’ in nucleus. What are that fundamental particles X & Y are?

In an atom the fundamental particles are present such as electrons (negative charge), protons (positive charge) and neutrons (charge less).

Electrons are revolve around the nucleus whereas protons present in the nucleus. Therefore, X and Y are electrons and protons