Structure of Atom – Multiple Choice Questions (MCQs)

1. 25. The number of nodes in an 's' orbital is:

   • A. n-1
   • B. n
   • C. n+1
   • D. n-l-1

2. 26. The number of radial nodes in a '3p' orbital is:

   • A. 1
   • B. 0
   • C. 2
   • D. 3

3. 27. The number of angular nodes in a 'p' orbital is:

   • A. 1
   • B. 0
   • C. 2
   • D. 3

4. 28. What is the maximum number of electrons in a subshell with l = 2?

   • A. 10
   • B. 6
   • C. 14
   • D. 2

5. 29. The electronic configuration of an element with atomic number 17 is:

   • A. [Ne] 3s2 3p5
   • B. [Ar] 4s1
   • C. [He] 2s2 2p5
   • D. [Ne] 3s2 3p6

6. 30. The number of orbitals in the 'p' subshell is:

   • A. 3
   • B. 1
   • C. 5
   • D. 7

7. 31. The total number of orbitals in a shell with principal quantum number 'n' is:

   • A. n^2
   • B. 2n^2
   • C. 2n
   • D. n+1

8. 32. The concept of stationary orbits was proposed by:

   • A. Niels Bohr
   • B. Ernest Rutherford
   • C. J.J. Thomson
   • D. Max Planck

9. 33. Planck's quantum theory states that energy is emitted or absorbed in discrete packets called:

   • A. Quanta
   • B. Photons
   • C. Electrons
   • D. Protons

10. 34. The photoelectric effect supports the idea that light has a:

    • A. Particle nature
    • B. Wave nature
    • C. Dual nature
    • D. None of these

11. 35. The minimum energy required to eject an electron from a metal surface is called:

    • A. Work function
    • B. Ionization energy
    • C. Electron affinity
    • D. Binding energy

12. 36. Which orbital is spherical in shape?

    • A. s orbital
    • B. p orbital
    • C. d orbital
    • D. f orbital