Distribution of Electrons in Atoms, Class 9 Science

1. There will be total 20 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 20

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 20

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 20

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 20

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 20

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 20

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 20

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

 Magnesium

  Helium

  Sodium

 Hydrogen

Question 8 of 20

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

 2

 3

 1

 4

Question 9 of 20

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 20

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

 I

 III

 IV

 II

Question 11 of 20

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 20

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

  Helium

 Krypton

 Neon

 Argon

Question 13 of 20

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 20

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

 6

 2

  4

  8

Question 15 of 20

16. What is a valence shell?

 Third shell

 First shell

 Outermost shell

 Second shell

Question 16 of 20

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

 A

 B

 C

 D

Question 17 of 20

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

 L shell

 N shell

 M shell

 K shell

Question 18 of 20

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

  2

 1

 3

 8

Question 19 of 20

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

 Neon

 Carbon

  Helium

 Argon

Question 20 of 20

 Loading…