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Structure of the Atom CBSE Class 9

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Question 1/20

Q 1. What is the correct electronic configuration of chlorine? 

Solution

The electronic configuration of chlorine is 2, 7. 

Q 2. Protons are represented with the letter 

Solution

Protons are represented with the letter p. 

Q 3. Which of the following is a false statement regarding isotopes? 

Solution

Isotopes have different atomic mass number. 

Q 4. According to the Rutherford's model of the atom, which subatomic particle revolved around the nucleus in a circular path? 

Solution

According to Rutherford's model of the atom, electrons revolved around the nucleus in a circular path. 

Q 5. The mass of an atom is determined by 

Solution

The mass of an atom is determined bynucleons. 

Q 6. Who proposed the model of an atom in 1903? 

Solution

Sir J.J. Thomson proposed the model of an atom in 1903. 

Q 7. Most alpha particles passed straight through the thin gold foil without any deflection. What did Rutherford conclude from this observation? 

Solution

Most alpha particles passed through the gold foil undeflected because most space inside the atom is empty. 

Q 8. Find the false statement regarding the subatomic particles of an atom. 

Solution

Protons are positively charged. 

Q 9. The size of the shell is determined by which quantum number? 

Solution

The size of the shell is determined by principal quantum number(n). 

Q 10. What is the electronic configuration of the P3-ion? 

Solution

The electronic configuration of the P3-ion is 2, 8, 8. 

Q 11. Both begin mathsize 12px style Cl presubscript 17 presuperscript 35 end style and begin mathsize 12px style Cl presubscript 17 presuperscript 37 end style are 

Solution

Both begin mathsize 12px style Cl presubscript 17 presuperscript 35 end styleand begin mathsize 12px style Cl presubscript 17 presuperscript 37 end style are isotopes. 

Q 12. The entire mass of an atom is concentrated in the 

Solution

The entire mass of an atom is concentrated in the nucleus. 

Q 13. How many electrons are present in the M shell of the Na atom with atomic number 11? 

Solution

There is 1 electron in the L shell of the Na atom. 

Q 14. Number of protons = Number of electrons =………….. 

Solution

Number of protons = Number of electrons = Atomic number 

Q 15. Which of the following is not an isotope of hydrogen? 

Solution

Trivium is not an isotope of hydrogen. 

Q 16. The number of protons present in an atom is equal to the 

Solution

The number of protons present in an atom is equal to the number of electrons. 

Q 17. Alpha particles are fast-moving 

Solution

Alpha particles are fast-moving helium nuclei. 

Q 18. Sir J. J. Thomson’s model of an atom was similar to 

Solution

Sir J. J. Thomson’s model of an atom was similar to Christmas pudding or plum cake with raisins or the cross section of a watermelon. 

Q 19. An ion differs from its atom in 

Solution

An ion differs from its atom in the number of electrons. 

Q 20. Which of the following models of an atom is similar to a cross section of a watermelon? 

Solution

Thomson’s modelof an atom is similar to a cross section of a watermelon. 

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