Class Base 

STRUCTURE OF ATOM

1. How many electrons will be present in the sub Shells having ms value of –l/ 2 for n=3?

2. A cricket ball of 0. 2 kg moves with a velocity of 500 ms -1. If its velocity can be measured within accuracy of 0.1%, what is the uncertainty in its position?

3. Give one application of line emission spectra

4. What is Zeeman effect?

5. What is the atomic number of the elements whose outermost electrons are represented by 3p5?

6. Mention the limitations of Bohr’s model of atom

7. How many electrons may have the quantum numbers n = 4, ms =- I/ 2?

8. A microscope using suitable photons is employed to locate an electron in an atom within a distance of 0.1 Ao.What is the uncertainty involved in the measurement of its velocity? (m= 9.1 x 10-31 kg)

9. Why is it not possible to determine the exact position and momentum of an electron simultaneously?

10. Mention the reason for the failure of Bohr’s model of an atom.

11. The principal quantum number is n=4 a) Find the number of orbitals associated with it b) Find the number of electrons present in it.

12. What is the wave length of light emitted when the electron in a hydrogen atom undergoes transition from n = 4 to n = 2 level?

13. State Hund’s rule.

14. How many electrons associated with the following quantum numbers?

(i) n = 4 l= 1 (ii)n=3 l =2 ms = + 1/ 2

15. Calculate the energy energy associated with the 2nd orbit of He +.

16. State Pauli’s exclusion principle.

17. The mass of an electron is 9.1X 10-31 kg. If its Kinetic energy is 3X 1025J, calculate its wave length.

18. Give the relationship between wave length and momentum of a moving microscopic particle. What is the relation known as?

19. Write the four quantum numbers of the outermost two electrons in Ca (At. No. 20)

20. Heisenberg’s uncertainty principle has no significance in our everyday life. Explain

21. What is the energy in joules required to shift the electron of the hydrogen atom from the first orbit to the fifth orbit and what of the wave length of light emitted when electron returns to the ground state.

22. Give the mathematical expression of uncertainty principle.

23. State the principle which justifies the statement_ an orbital cannot contain more than two electrons-

24. A golf ball has a mass of 40g and a speed of 45m/ s, calculate the uncertainty in the position.

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