MCQ Structure of the Atom Chapter 4 Class 9 Science

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MCQ’s For All Chapters – Science Class 9th

1. What happens to an atom when it loses one electron?

Question 1 of 20

2. The element with configuration 2,8,7 belongs to which group?

Question 2 of 20

3. The isotope used in treatment of cancer is

Question 3 of 20

4. If K and L shells are full, how many electrons are there?

Question 4 of 20

5. The number of electrons in sulphur atom (atomic number 16) is

Question 5 of 20

6. Which one of the following is true about isotopes of chlorine?

Question 6 of 20

7. The electronic configuration of neon is

Question 7 of 20

8. The maximum number of electrons in N shell is

Question 8 of 20

9. What is the relation between atomic number and number of electrons in a neutral atom?

Question 9 of 20

10. The mass number of oxygen is 16 and atomic number is 8.Its number of neutrons is

Question 10 of 20

11. The electron distribution of phosphorus (Z=15) is

Question 11 of 20

12. Which of the following atoms has a stable electronic configuration?

Question 12 of 20

13. An element X forms an ion X²⁻ with configuration 2,8.What is atomic number of X?

Question 13 of 20

14. Which scientist discovered the nucleus?

Question 14 of 20

15. What was the main observation in Rutherford’s experiment?

Question 15 of 20

16. Which one of the following is correct for a neutral atom of fluorine?

Question 16 of 20

17. If the ratio of chlorine isotopes (³⁵Cl:³⁷Cl) is 3:1, what percentage of ³⁷Cl is present?

Question 17 of 20

18. The average atomic mass of bromine with 79Br (49.7%) and 81Br (50.3%) is approximately

Question 18 of 20

19. Which postulate of Bohr’s model explains atomic stability?

Question 19 of 20

20. The number of protons in ³⁷₁₇Cl is

Question 20 of 20


 

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