Module II: Atomic Structure and Chemical Bonding - HW-02-02

Chapter Name - ATOMIC STRUCTURE - 2
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Q1. Compare the mass of an electron with that of the proton.

Q2. What is a fundamental particle?

Q3. What is the name given to neutral particles in the atom?

Q5. List the three constituent particles of an atom.

Q6. What was the aim of Rutherford’s α-rays scattering experiment?

Q7. Briefly describe Rutherford’s model of an atom.

Q8. On what basis was the Rutherford’s model rejected?

Q9. What is an electromagnetic radiation?

Q10. List any three characteristics of electromagnetic radiation.

Q11. What is wave number? How is it related to wave length?

Q12. What is the difference between a ‘quantum’ and a ‘ photon’?

Q13. What is the difference between a line spectrum and a continuous spectrum?

Q14. What are the main postulates of Bohr’s model?

Q15. How does the energy of a Bohr orbit vary with the principle quantum number‘n’.

Q16. What do you understand by wave-particle duality?

Q17. Name the experiment that established the wave nature of electron.

Q18. Compute the de-Broglie wavelength associated with an electron moving with a velocity of 100 km /second? (me= 9.1 x 10-31kg)

Q19. State Heisenberg’s Uncertainty Principle?

Q20. What do you understand by a Wave Function?

Q21. What is the difference between an orbit and an orbital?

Q22. What are quantum numbers? List different quantum numbers obtained from Schrödinger Wave Equation?

Q23. Give the significance of the principal, azimuthal and magnetic quantum numbers?

Q24. What are the shapes of s,p and d orbitals?

Q25. Describe the shape of a 2s orbital. How is it different from that of a 1s orbital?

Q26. What do you understand by
(i) a spherical node?
(ii) a nodal plane?

Q27. How many spherical nodes will be there in 3s orbital ?

Q28. What do you understand by the electronic configuration of an atom?

Q29. What is Pauli’s exclusion principle?

Q30. What is Aufbau principle? What are ( n + l ) rules?

Q31. Which of the following orbitals will be filled first?
i) 2p or 3s ii) 3d or 4s

Q32. The electronic configuration of Cr is (Ar)3d5 4s1 not 3d4 4s2

Q33. (a) What are the three fundamental particles that constitute an atom? (b) Compare the charge and mass of an electron and of a proton.

Q34. What do you think is the most significant contribution of Rutherford to the development of atomic structure?

Q35. What experimental evidence shows the dual nature of light? (a) Compute the energy of a FM radio signal transmitted at a frequency of 100 MHz. (b) What is the energy of a wave of red light with l = 670 nm?

Q36. In what way was the Bohr’s model better than the Rutherford’s model?

Q37. What are the drawbacks of Bohr’s Model?

Q38. What led to the development of Wave Mechanical Model of the atom?

Q39. What do you understand by an orbital? Draw the shapes of s and p orbitals.

Q40. Explain the Hund’s rule of maximum multiplicity with the help of an example.