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

Chemistry

1. Number of neutrons in ²⁷₁₃ M are:

15

27

13

14

Question 1 of 10

2. M shall has sub-shells:

1s, 2s, 3s

2s, 2p

3s, 3p, 3d

1s, 2s

Question 2 of 10

3. Which isotope is used in nuclear reactors?

U-238

All of these

U-234

U-235

Question 3 of 10

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

They have same chemical properties

They have sane number of protons

They have sane atomic number

They have same physical properties

Question 4 of 10

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

Carbon-14

Iodine-131

Iodine-123

Cobalt-60

Question 5 of 10

6. ₁₁Na has electronic configuration:

1s²2s²2p⁵3s²

1s²2s²2p⁷

1s²2s²2p⁶3s¹

1s²2s²3s¹

Question 6 of 10

7. According to Bohr atomic model:

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

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

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

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

Question 7 of 10

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

s

p

f

d

Question 8 of 10

9. Chlorine has two isotopes, both of which have

Same mass number

Same number of electrons

Same number of neutrons

Different number of protons

Question 9 of 10

10. Rutherford used _____________ particles in his experiments.

He⁺²

He⁻²

He⁺

He atoms

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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