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Structure of the Atom - Class 9 Science Quiz

A Quiz for CBSE Class 9 Science Students (Set 5)

Welcome to the Structure of the Atom Quiz! This quiz is designed for CBSE Class 9 Science students and focuses solely on the content from Chapter 4 of your science textbook. Test your understanding of fundamental concepts related to sub-atomic particles, atomic models, electron distribution, valency, atomic number, mass number, isotopes, and isobars. This is Set 5 of 5, containing 10 multiple-choice questions. Good luck!

1. Who discovered the electron?

A) Ernest Rutherford B) J.J. Thomson C) Neils Bohr D) James Chadwick

2. Who discovered the proton?

A) J.J. Thomson B) James Chadwick C) Ernest Rutherford D) John Dalton

3. Who discovered the neutron?

A) J.J. Thomson B) Ernest Rutherford C) James Chadwick D) Neils Bohr

4. What was the main conclusion drawn from Rutherford's alpha-particle scattering experiment?

A) Atoms are indivisible. B) The positive charge is spread throughout the atom. C) There is a small, dense, positively charged nucleus at the center of the atom. D) Electrons orbit the nucleus in fixed energy shells.

5. According to Thomson's model of the atom, where are the electrons located?

A) Concentrated in a small nucleus. B) Scattered like plums in a pudding of positive charge. C) Orbiting in fixed energy levels. D) Randomly distributed outside the nucleus.

6. An atom has a valency of 3. What does this mean?

A) It has 3 protons. B) It has 3 electrons in its outermost shell. C) It can lose or gain 3 electrons to achieve a stable octet. D) Its atomic number is 3.

7. What is the maximum number of electrons that can be accommodated in the L-shell (second shell) of an atom?

A) 2 B) 8 C) 18 D) 32

8. The atomic number of an element is 12 and its mass number is 24. How many electrons does a neutral atom of this element have?

A) 12 B) 24 C) 6 D) 36

9. Which of the following elements has 1 valence electron?

A) Oxygen B) Neon C) Sodium D) Carbon

10. What are isobars?

A) Atoms of the same element with different mass numbers. B) Atoms of different elements with the same atomic number but different mass numbers. C) Atoms of different elements with different atomic numbers but the same mass number. D) Atoms with the same number of neutrons.

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Structure of the Atom - Class 9 Science Quiz

A Quiz for CBSE Class 9 Science Students (Set 5)

1. Who discovered the electron? Read

2. Who discovered the proton? Read

3. Who discovered the neutron? Read

4. What was the main conclusion drawn from Rutherford's alpha-particle scattering experiment? Read

5. According to Thomson's model of the atom, where are the electrons located? Read

6. An atom has a valency of 3. What does this mean? Read

7. What is the maximum number of electrons that can be accommodated in the L-shell (second shell) of an atom? Read

8. The atomic number of an element is 12 and its mass number is 24. How many electrons does a neutral atom of this element have? Read

9. Which of the following elements has 1 valence electron? Read

10. What are isobars? Read