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Structure of the Atom - Class 9 Science Quiz

A Quiz for CBSE Class 9 Science Students (Set 3)

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 3 of 5, containing 10 multiple-choice questions. Good luck!

1. What defines the atomic number (Z) of an element?

A) The total number of protons and neutrons B) The number of electrons in its outermost shell C) The number of protons present in the nucleus D) The sum of protons and electrons

2. The mass number (A) of an atom is the sum of the number of which two sub-atomic particles?

A) Protons and electrons B) Neutrons and electrons C) Protons and neutrons D) Ions and protons

3. What is the atomic number of an element whose atom has 11 protons?

A) 11 B) 12 C) 23 D) 1

4. How are isotopes of an element defined?

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

5. What is the key difference between isotopes of the same element?

A) Number of protons B) Number of electrons C) Number of neutrons D) Chemical reactivity

6. Which of the following pairs are isotopes?

A) Carbon-12 and Nitrogen-14 B) Hydrogen-1 and Hydrogen-2 (Deuterium) C) Oxygen-16 and Oxygen-18 D) Both B and C

7. If an atom has an atomic number of 17 and a mass number of 35, how many neutrons does it have?

A) 17 B) 18 C) 35 D) 52

8. What are atoms of different elements with different atomic numbers but the same mass number called?

A) Isotopes B) Isobars C) Ions D) Isomers

9. How many electrons can be accommodated in the K-shell (first shell) of an atom?

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

10. An atom has 2 electrons in its K shell and 8 electrons in its L shell. What is the valency of this atom?

A) 0 B) 1 C) 2 D) 8

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Structure of the Atom - Class 9 Science Quiz

A Quiz for CBSE Class 9 Science Students (Set 3)

1. What defines the atomic number (Z) of an element? Read

2. The mass number (A) of an atom is the sum of the number of which two sub-atomic particles? Read

3. What is the atomic number of an element whose atom has 11 protons? Read

4. How are isotopes of an element defined? Read

5. What is the key difference between isotopes of the same element? Read

6. Which of the following pairs are isotopes? Read

7. If an atom has an atomic number of 17 and a mass number of 35, how many neutrons does it have? Read

8. What are atoms of different elements with different atomic numbers but the same mass number called? Read

9. How many electrons can be accommodated in the K-shell (first shell) of an atom? Read

10. An atom has 2 electrons in its K shell and 8 electrons in its L shell. What is the valency of this atom? Read