Atomic Structure – Chemistry 9th – Level 5

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Atomic Structure - Level 5

Chapter 2 - Chemistry Class 9th - Test Preparation MCQs

Chapter : Atomic Structure (Level 5)
Subject : Chemistry
Class : 9th
Board : Sindh Board
Total MCQs : 10
Extract From : 9th Class Note Book
Time : 5 Minutes (30 Seconds for Each Question)

  1. Different elements have different atomic numbers because of different number of:
  2. Atomic number of Carbon (C) is 6. Each carbon atom has:
  3. The total sum of proton and neutrons in the nucleus of an atom is called:
  4. Mass number represented by:
  5. The sodium (Na) atom has Z = 11 and mass number A = 23. It has:
  6. Uranium, Radium and Polonium are:
  7. An atom consist of a positively charged, dense and very small nucleus containing protons and neutron. The entire mass is concentrated in the nucleus of an atom. It is a postulate of:
  8. The electrons are revolving around the nucleus in circular paths. These circular paths are known as:
  9. The energy levels are represented by an integer (n = 1, 2, 3....) known as:
  10. The emission or absorption is discontinuous in the form of an energy packet called:

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1. The emission or absorption is discontinuous in the form of an energy packet called:

2 / 10

2. An atom consist of a positively charged, dense and very small nucleus containing protons and neutron. The entire mass is concentrated in the nucleus of an atom. It is a postulate of:

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3. Uranium, Radium and Polonium are:

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4. The sodium (Na) atom has Z = 11 and mass number A = 23. It has:

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5. The total sum of proton and neutrons in the nucleus of an atom is called:

6 / 10

6. Mass number represented by:

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7. The electrons are revolving around the nucleus in circular paths. These circular paths are known as:

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8. Atomic number of Carbon (C) is 6. Each carbon atom has:

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9. The energy levels are represented by an integer (n = 1, 2, 3....) known as:

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10. Different elements have different atomic numbers because of different number of:

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