Directions: In the questions given below, four options have been given. Click on the option which you think is the RIGHT ANSWER to the question.

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1. Which of the following defines the Mass number of an atom?

2. Who is credited with the discovery of electron?

3. An atom has a mass number of 37 and atomic number 17. How many protons does it have?

4. Which of the following mostly accounts for the mass of an atom?

5. Within an atom, the nucleus when compared to the extra nuclear part is -

6. What would be the atomic number of the element in whose atom the K and L shells are full?

7. Which metal was used by Rutherford in his alpha-scattering experiment?

8. An element has an electronic configuration of 2, 8, 7. Its valency is

9. During a chemical reaction, atomic number

10. Which isotope of hydrogen contains only one proton and no neutron in its nucleus?

11. Who of the following was awarded the Nobel Prize for his measurement of elementary electronic charge?

12. How are the subshells in an atom labelled?

13. The isotopes of neutral atoms of an element differ in


14. The electronic configuration of an atom having atomic number 20 is

15. Almost the entire mass of an atom is concentrated in the

16. An atom differs from its ion in -

17. The proton is heavier than an electron by -

18. Which of the following is true about a charged atom?

19. Which of the following is not a fundamental particle?

20. Which one among the following most correctly determines the atomic number of an element?

21. Which of the following is the correct electronic configuration of Nickel with an atomic number 28?

22. How many electrons does the outermost shell of neon have?

23. Which of the following determines the chemical properties of an element?

24. The number of protons in a negatively charged atom (anion) is -

25. Atoms which have same mass number but different atomic number are called -

26. The atomic theory of matter was first proposed by