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

Chemistry

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

s

d

p

f

Question 1 of 10

2. Chlorine has two isotopes, both of which have

Same number of electrons

Same number of neutrons

Same mass number

Different number of protons

Question 2 of 10

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

Cobalt-60

Iodine-131

Carbon-14

Iodine-123

Question 3 of 10

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

They have same physical properties

They have sane number of protons

They have same chemical properties

They have sane atomic number

Question 4 of 10

5. Which isotope is used in nuclear reactors?

U-238

All of these

U-235

U-234

Question 5 of 10

6. ₁₁Na has electronic configuration:

1s²2s²2p⁶3s¹

1s²2s²2p⁷

1s²2s²3s¹

1s²2s²2p⁵3s²

Question 6 of 10

7. Number of neutrons in ²⁷₁₃ M are:

13

14

27

15

Question 7 of 10

8. 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 8 of 10

9. Rutherford used _____________ particles in his experiments.

He atoms

He⁺²

He⁺

He⁻²

Question 9 of 10

10. M shall has sub-shells:

1s, 2s

1s, 2s, 3s

2s, 2p

3s, 3p, 3d

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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