MCQ Distribution of Electrons in Atoms Chapter 4 Class 9 Science

MCQ’s For All Chapters – Science Class 9th

1. There will be total 24 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. N shell can have a maximum of _______ electrons.

32

2

18

8

Question 1 of 24

2. If both K and L shells are filled, the total number of electrons contained in them will be:

10

8

6

4

Question 2 of 24

3. Which of the following is the correct electronic configuration for magnesium?

2, 8, 1

2, 8, 3

2, 8, 4

2, 8, 2

Question 3 of 24

4. The number of electrons in an atom of Fluorine is 9. Its electronic configuration is _______ .

8, 1

7, 2

2, 7

1, 8

Question 4 of 24

5. Bohr proposed that while revolving in discrete orbits, the electrons:

Gain energy

Lose energy

Do not radiate energy

First lose energy and then gain energy.

Question 5 of 24

6. The electronic configuration of an atom with atomic number 19 is:

2, 8, 8, 1

1, 2, 2, 8

2, 8, 9

2, 10, 7

Question 6 of 24

7. The following diagram shows the various shells. The maximum number of electrons that can be accomodated in M shell is _______ .

18

8

2

32

Question 7 of 24

8. Which of the following elements has the electron configuration 2?

Magnesium

Helium

Sodium

Hydrogen

Question 8 of 24

9. What will be the valency of an element having atomic number (Z)=7?

2

3

1

4

Question 9 of 24

10. Each of the stationary orbits are associated with:

A certain amount of velocity.

A certain amount of mass.

A certain amount of energy.

A certain amount of force.

Question 10 of 24

11. Which of the following pictures represent the Bohr's model of an atom?

I

III

IV

II

Question 11 of 24

12. The increasing order of the energy levels in an atom is _______ .

K > L > M > N

L > M > N > K

L < M < N < K

K < L < M < N

Question 12 of 24

13. Which one of the following elements has two valence electrons but is a noble gas?

Helium

Krypton

Neon

Argon

Question 13 of 24

14. The maximum number of electrons that can be accomodated in an orbit is given by the formula _______ where n is the number of orbit.

2n + 2

2(n + 2)

2/n²

2n²

Question 14 of 24

15. If Z = 6, what would be the valency of the element?

6

2

4

8

Question 15 of 24

16. What is a valence shell?

Third shell

First shell

Outermost shell

Second shell

Question 16 of 24

17. Which of the following is the correct atomic structure of sodium metal?

A

B

C

D

Question 17 of 24

18. Which of the following shells represent the orbit number (n) = 2?

L shell

N shell

M shell

K shell

Question 18 of 24

19. How many valence electrons are present in a potassium atom?

2

1

3

8

Question 19 of 24

20. Which one of the following elements is most reactive?

Neon

Carbon

Helium

Argon

Question 20 of 24

21. Assertion : For noble gases, valency is zero.
Reason : Noble gases have 8 valence electrons.

a.) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b.) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c.) Assertion is true but Reason is false.

d.) Assertion is false but Reason is true.

Question 21 of 24

22. Assertion : The mass of the total number of protons and neutrons is a measure of the approximate mass of an atom.
Reason : The mass of an electron is negligible.

a.) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b.) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c.) Assertion is true but Reason is false.

d.) Assertion is false but Reason is true.

Question 22 of 24

23. Assertion : Isotopes are electrically neutral.
Reason : Isotopes are species with same mass number but different atomic numbers

a.) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b.) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c.) Assertion is true but Reason is false.

d.) Assertion is false but Reason is true.

Question 23 of 24

24. Assertion : Atoms are electrically neutral.
Reason : A neutral particle, neutron, is present in the nucleus of an atom.

a.) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.

b.) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.

c.) Assertion is true but Reason is false.

d.) Assertion is false but Reason is true.

Question 24 of 24

 Loading...