Punjab 9th Class Chemistry Chapter 2 Structure of Atoms Mcqs Test Online Solved With Right Answers

Chemistry

1. M shall has sub-shells:

2s, 2p

1s, 2s, 3s

1s, 2s

3s, 3p, 3d

Question 1 of 10

2. Number of neutrons in ²⁷₁₃ M are:

27

13

15

14

Question 2 of 10

3. Which of the following statement is not correct about isotopes?

They have sane number of protons

They have sane atomic number

They have same chemical properties

They have same physical properties

Question 3 of 10

4. Which isotope is used in nuclear reactors?

U-238

U-234

U-235

All of these

Question 4 of 10

5. Chlorine has two isotopes, both of which have

Different number of protons

Same number of neutrons

Same number of electrons

Same mass number

Question 5 of 10

6. ₁₁Na has electronic configuration:

1s²2s²2p⁷

1s²2s²2p⁵3s²

1s²2s²2p⁶3s¹

1s²2s²3s¹

Question 6 of 10

7. Which isotope is commonly used to irradiate cancer calls?

Carbon-14

Iodine-131

Cobalt-60

Iodine-123

Question 7 of 10

8. According to Bohr atomic model:

The further the electron is form the nucleus, the more energy it has

Each orbit has fixed energy, so each orbit is called sub-energy level

The energy of the electron is inversely proportional to its distance from the nucleus.

Light is absorbed when an electron jumps a lower energy orbit.

Question 8 of 10

9. A sub-shell that can accommodate 6 electrons is:

f

s

p

d

Question 9 of 10

10. Rutherford used _____________ particles in his experiments.

He⁺

He atoms

He⁺²

He⁻²

Question 10 of 10

Punjab 9th Class Chemistry Chapter 2 Structure of Atoms Mcqs Test Online

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Punjab 9th Class Chemistry Chapter 2 Structure of Atoms Mcqs Test Online

Punjab 9th Class Chemistry Chapter 2 Structure of Atoms 9th Class Punjab

Chemistry

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