Structure of Atom Mock Test – Class 11 Chemistry

1. The central idea of internal atomic structure is best expressed as

2. According to the rule, the subshell with the smaller value of

3. A table combines quantum numbers and orbital capacities.

The claim that is not valid is

4. The Aufbau principle is used to decide

5. A nucleus contains protons and neutrons. Its proper nuclear notation is

6. A hydrogen spectrum line has and . The wave number of this limiting line is

7. An oil droplet carries excess electrons. The charge on the droplet is

8. A model of the atom that ignores electrons would fail first in explaining

9. A student writes the following relation chain for radiation:

If , , and , the photon energy is closest to

10. Rutherford's model also failed to explain the line spectrum of hydrogen because it did not include

11. Four species are listed below.

The species with protons and electrons is

12. An atom has a subshell. Treat the subshell as seven equal-energy orbital orientations with . According to Hund's rule and the Pauli exclusion principle, which description is correct?

13. The configuration represents a neutral atom. Its highest principal shell and valence-shell electron count are

14. A student uses for a moving electron and for a photon. The main distinction between the two uses of is that

15. A table compares two subatomic particles.

Particle P is most reasonably identified as

16. In the quantum mechanical model of the atom, an orbital is described as

17. A graph of maximum kinetic energy versus frequency for a metal is shifted to the right for another metal, but the slope remains the same. The second metal has

18. A metal has threshold frequency . Incident radiation of frequency is made very intense. The expected result is

19. For a hydrogen spectral line, the transition is compared with . The correct comparison is that

20. A droplet has charge . Taking , the number of excess electrons on the droplet is

21. The region of the electromagnetic spectrum just beyond visible violet on the higher-frequency side is

22. In a plot of against for electromagnetic radiation in vacuum, the slope represents

23. An orbital is described as having radial nodes and angular node. The orbital could be

24. The expression for nuclear charge means that

25. For hydrogen, the energy of the level according to is closest to

26. A neutral magnesium atom has configuration . The configuration of is

27. A nucleus is changed by adding one neutron while keeping the number of protons unchanged. The immediate effect is that

28. A particle of mass moves with speed . Taking , its de Broglie wavelength is closest to

29. A learner writes the following note: "Cathode rays were studied by placing a gas at ordinary atmospheric pressure in an open vessel and heating it strongly." The part of the note that needs correction is that cathode-ray studies require

30. In the photoelectric effect, emission begins without measurable delay when radiation of sufficient frequency falls on a suitable metal surface. This observation supports the idea that

31. The main reason for studying the structure of the atom is that it helps explain

32. A hydrogen atom is in . The minimum energy needed to ionize it from this level is

33. A neutral atom has the configuration . A student says it has unpaired electrons because the last superscript is . The correct number of unpaired electrons is

34. A species has electrons and nuclear charge . The species is best written as

35. A body loses electrons. Its charge becomes

36. A modified discharge tube gives canal rays that are deflected toward the negative plate. This shows that canal rays contain

37. A radiation has frequency . Taking , its wavelength is

38. Average atomic mass of an element is calculated as a weighted average because naturally occurring samples may contain

39. Two transitions in hydrogen are compared:
I.
II.
For these two Balmer lines, the line with higher wave number is

40. A hydrogen spectral line is observed in the Balmer series with wave number . The transition producing this line is

41. For a orbital, the numbers of radial nodes and angular nodes are respectively

42. A subshell is labeled . The values of and for this subshell are respectively

43. The fluorescent screen in Rutherford's scattering experiment was used to

44. Isobars are atoms that have

45. Millikan's oil drop experiment is most closely associated with the determination of

46. Assertion: The mass number of is .
Reason: In , the upper number represents the total number of protons and neutrons.

47. Cathode rays can produce heating when they strike a metal target. This observation is best explained by the fact that the rays

48. If an electron emits a photon of frequency during a Bohr transition, the energy difference between the two levels is

49. A moving electron and a moving dust particle have the same speed. The electron shows a more noticeable de Broglie wavelength mainly because it has

50. A neutral calcium atom has the configuration . The configuration of is