1. The atoms, in which the number of protons is same but the number of neutrons is different, are known as

2. Which of the following is not a part of an atom?

3. In an atom, the order of filling up the orbitals is governed by

4. What is the maximum number of electrons in the -shell?

5. The uncertainty principle was proposed by

6. Which among the following is an incorrect option?

7. The number of electrons and neutrons in an element is 18 and 20 , respectively. Its mass number is

8. The mass number of a nucleus is

10. Isotopes of an element differ in

11. The maximum kinetic energy of emitted electrons in a photoelectric effect does not depend upon

12. Quantum nature of light is not supported by the phenomenon of

13. What are isotones?

15. The efforts to detect the existence of Higgs-boson particle have become frequent news in the recent past. What is/are the importance of discovering this particle?

1. It will help us to understand as to why elementary particles have mass.
2. It will enable us in the near future to develop the technology to transfer matter from one point to another without traversing the physical space between them.

       3. It will enable us to create better fuel for nuclear fission.
Select the correct answer using the codes given below.