Class 9 MCQ Questions for Chapter 4 Structure of the Atom with Answers

We have compiled the MCQ Questions for Class 9 Science Chapter 4 Structure of the Atom with Answers Pdf free download covering the entire syllabus for CBSE Class 9 Science. Practice MCQ Questions for Class 9 Science with Answers on a daily basis and score well in exams. Refer to the Structure of the Atom  Class 9 MCQs Quiz Questions with Answers here along with a detailed explanation.

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MCQ Questions for Class 9 Science Chapter 4 Structure of the Atom with Answers

MCQ Questions for Class 9 Science Chapter 4 Structure of the Atom with Answers

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1. Which of the following are true for an element?
(i) Atomic number = number of protons + number of electrons
(ii) Mass number = number of protons + number of neutrons
(iii) Atomic mass = number of protons = number of neutrons
(iv) Atomic number = number of protons = number of electrons

 
 
 
 

2. Which of the following are called nucleon?

 
 
 
 

3. Which of the following correctly represents the electronic distribution in the Mg atom?

 
 
 
 

4. Why do most of the elements try to participate in the chemical combinations?

i. To gain more electrons

ii. To achieve Inert Gas configuration

iii. To complete their octet

iv. To complete their inner shells

Choose the correct option among the following

 
 
 
 

5. The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?

 
 
 
 

6. Which of the following statement is always correct?

 
 
 
 

7. The first model of an atom was given by

 
 
 
 

8. Rutherford’s ‘alpha (α) particles scattering experiment’ resulted in the discovery of

 
 
 
 

9. What property of an element determines its chemical behaviour?

 
 
 
 

10. . Which of the following elements does not exhibit the electrovalencey?

 
 
 
 

11. Isobars do not differ in the number of

 
 
 
 

12.  What was the source of alpha particles in Rutherford scattering experiment?

 
 
 
 

13. Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order
(i) Rutherford’s atomic model
(ii) Thomson’s atomic model
(ii) Bohr’s atomic model

 
 
 
 

14. Which one of the following is a correct electronic configuration of sodium?

 
 
 
 

15. Which radioactive element is used in the treatment of cancer?

 
 
 
 

16. An atom with 3 protons and 4 neutrons will have a valency of

 
 
 
 

17.  What prevents an atom from being collapsed?

 
 
 
 

18. An alpha particle is also known as:

 
 
 
 

19. Isotopes of an element have:

 
 
 
 

20. How many electrons are present in M-shell of an element with atomic number 20?

 
 
 
 

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