Science MCQ Structure of the Atom Chapter 4 Class 9

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MCQ’s For All Chapters – Science Class 9th

1. Which of the following atoms has a valency of two?

Question 1 of 20

2. If an element has electronic configuration 2,8,2, its atomic number is

Question 2 of 20

3. An atom of aluminium has atomic number 13.How many electrons are in its M shell?

Question 3 of 20

4. Which of the following has the highest number of neutrons?

Question 4 of 20

5. Which statement about isotopes is incorrect?

Question 5 of 20

6. The average atomic mass of chlorine is 35.5 u.Which statement explains this?

Question 6 of 20

7. A neutral atom of calcium (atomic number 20) has how many electrons in the L shell?

Question 7 of 20

8. If an atom has 3 shells completely filled, what will be its total number of electrons?

Question 8 of 20

9. The atom of an element X has 6 protons and 8 neutrons.The symbol of the element is

Question 9 of 20

10. Which element forms an ion with configuration 2,8?

Question 10 of 20

11. An atom has mass number 31 and atomic number 15.The number of neutrons is

Question 11 of 20

12. The number of nucleons in an atom with atomic number 17 and mass number 35 is

Question 12 of 20

13. Which of the following pairs represents isobars?

Question 13 of 20

14. How many electrons can be present in the M shell?

Question 14 of 20

15. Which statement correctly describes Rutherford’s model?

Question 15 of 20

16. The major limitation of Rutherford’s model was that it could not explain

Question 16 of 20

17. If number of protons = number of electrons = 8, the atom is

Question 17 of 20

18. What will be the mass number of an atom with 11 protons and 12 neutrons?

Question 18 of 20

19. How many neutrons are present in ¹⁴₆C?

Question 19 of 20

20. The isotope of uranium used in nuclear reactors is

Question 20 of 20


 

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