Answer the following question:
Amit was discussing the structure of atom with his classmates. During the discussion, he learnt that an element X has a mass number of 39 and contains 20 neutrons. Based on this information, answer the following questions:
1. How many electrons and protons does element Z have?
2. Which of the folllowing the correct order of increase in the energy level of shells?
3. What will be the mass number if two neutrons are added to its nucleus?