Structure of Atom
I. MCQ - Choose Appropriate Alternative
1. The charge on an electron is __________. (-2.46 x 104 coulombs, -1.6 x 10-19 coulombs, 1.6 x 10-9coulombs)
2. The maximum number of electrons that can accommodated by a p-orbital is __________. (2, 6, 10)
3. A proton is __________. (a helium ion, a positively charged particle of mass 1.67 x 10-27 kg, a positively charged particle of mass 1/1837 that of Hydrogen atom)
4. Most penetrating radiation of a radioactive element is __________. (a-rays, b-rays, g-rays)
5. The fundamental particles of an atom are __________. (Electrons and protons, electrons and neutrons, Electrons, Protons, Neutrons)
6. The fundamental particles of an atoms are __________. (the number of protons, The number of neutrons, The sum of protons and neutrons)
7. “No two electrons in the same atoms can have identical set of four quantum numbers.” This statement is known as __________. (Pauli’s Exclusion Principle, Hund’s rule, Aufbau Rule)
8. __________ has the highest electronegativity value. (Fluorine, Chlorine, Bromine)
9. Principle Quantum number describes __________. (Shape of orbital , size of the orbital, Spin of electron in the orbital)
10. Canal rays are produced from __________. (Anode, Cathode, Ionization of gas in the discharge tube)
11. Electromagnetic radiation produce from nuclear reactions are known as __________. (a-rays, b-rays, g-rays)
12. Cathode rays consist of __________. (Electorns, Protons, Positrons)
13. The properties of cathode rays __________ upon the nature of the gas inside the tube. (depend, partially depend, do not depend)
14. Anode rays consists of __________ particles. (Negative, Positive, Neutral)
15. Atomic mass of an element is equal to the sum of __________. (electrons and protons, protons and neutrons, electrons and neutrons)
16. Neutrons were discovered by __________. (Faraday, Dalton, Chadwick)
17. The value of Plank’s constant is __________. (6.626 x 10-34, 6.023 x 1024, 1.667 x 10-28)
18. P-orbitals are __________ in shape. (spherical, diagonal, dumb bell)
19. The removal of an electron from an atom in gaseous state is called __________. (Ionization energy, Electron Affinity, Electronegativity)
20. The energy released when an electron is added to an atom in the gaseous state is called __________. (Ionization Potential, electron Affinity, Electronegativity)
21. The power of an atom to attract a shared pair of electrons is called __________. (Ionization Potential, Electron Affinity, Electronegativity)
22. Electronegativity of Fluorine is arbitrarily fixed as __________. (2, 3, 4)
23. The energy difference between the shells go on __________ when moved away from the nucleus. (Increasing, decreasing, equalizing)
24. __________ discovered that the nucleus of an atom is positively charged. (William Crooke’s, Rutherford, Dalton)
25. Isotopes are atoms having same __________ but different __________. (Atomic weight, Atomic number, Avogadro’s Number)
26. __________ consists of Helium Nuclei or Helium ion (He++).
27. The angular momentum of an electron revolving around the nucleus of atom is __________. (nh/2p, n2h2/2p, nh3/3p)
28. The wavelengths of X-rays are mathematically related to the __________ of anticathode element. (atomic weight, atomic number, Avogadro’s number)
29. Lyman Series of spectral lines appear in the __________ portion of spectrum. (Ultraviolet, Infra red, Visible)
30. According to __________ electrons are always filled in order of increasing energy. (Pauli’s Exclusion Principle, Uncertainty Principle, Aufbau Principle)
II. Fill in the Blank
1. The maximum number of electrons in 2p orbital is __________.
2. 3d orbital has __________ energy than 4s orbital.
3. __________ rays are non-material in nature.
4. Charge to mass ratio of cathode rays resembles to that of __________.
5. __________ rays are most penetrating.
6. Neutrons have mass equal to that of __________.
7. Energy is __________ when an electron jumps from higher to lower orbit.
8. Second Ionization Potential has __________ value than the First Ionization Potential.
9. Electronegativity __________ from left to right in a period of Periodic Table.
10. __________ was discovered during the course of Artificial Radioactivity.
11. The velocity of alpha rays is nearly __________ of velocity of light.
12. Natural Radioactivity is confined in __________ elements.
13. The isotopes of an element differ in their __________.
14. Two electrons with the __________ spin, can never occupy the same atomic orbital.
15. ‘Al’ has electronic configuration, 1s2, 2s2, __________.
16. In a group of Periodic Table, the ionization potential __________ from top to bottom as the size of atom increases.
17. Ionization potential values __________ from left to right in a period.
18. The energy required to remove the most loosely bond electron from an atom in gaseous state is called __________.
19. The SI unit of Ionization Potential is __________.
20. An atom of sodium possesses 11 protons and __________ neutrons.
21. The particles of Cathode rays possess __________ charge.
22. The negatively charged particles found in Cathode rays are named as __________.
23. Positive rays are emitted from __________.
24. __________ rays are also known as Canal rays.
25. __________ consists of helium ions and are doubly positively charged.
26. __________ rays consists of negatively charged particles.
27. __________ rays are light waves of very short wavelength.
28. The phenomenon in which a stable element is made radioactive by artificial disintegration is called __________.
29. The electron move around the nucleus in different circular paths called __________.
30. The maximum number of electron in a shell is determined by the formula __________.
31. A particle whose mass is equal to that of electron but carries a positive charge is called __________.
32. 2p electrons are __________ in energy that 2s electrons in the same atom.
33. Number of protons of an element also indicates its __________.
34. According to __________ Principle electrons are fed in the order of increasing orbital energy.
35. According to __________ electrons are distributed among the orbitals of a sub shell to give maximum number of unpaired electron and have same spin.
36. The specific way in which the orbitals of an atom are occupied by electrons is called __________.
37. __________ rays are stream of doubly positively charged particles.
38. Electron in the outer most shell of an atom is called __________.
39. Protons are found in the __________ of an atom and bear __________ charge.
40. The atomic number of an atom is the sum of __________ inside the nucleus.
41. __________ limits the number of electron to different shell or orbits.
42. Sir William Crookes in 1878, discovered that the cathode in high vacuum tube emit radiations what he called __________.
43. X-rays were discovered in 1895 by __________.
44. The discovery of proton was done in 1886 by __________.
45. Neutrons were discovered by __________ in 1932 by the bombardment of beryllium with alpha particles.
46. Each atom has a __________, which contains all the positive charge and practically all the mass of atom.
47. Complete the reaction: 4Be9 + 2H4 → __________ + __________.
48. __________ have higher ionization power as compared to b-rays.
49. No dark spaces between the colours are present in __________.
50. The symbol e+ represents __________.
51. p-orbitals are __________ shaped.
52. The energy released when an electron is added to an atom in the gaseous state is called __________.
53. The power of an atom to attract a shared pair of electrons towards itself is called __________.
54. Fluorine is __________ electronegative than chlorine.
55. Lyman series of spherical lines appear in the __________ portion of spectrum.
56. The electrons with __________ spin occupy the same orbital.
57. 3d orbital has __________ energy than 4s orbital.
58. Energy and frequency are __________ proportional to each other.
59. Ionic radii of cations are __________ than the atoms from which they are formed.
60. Ionic radii of anions are __________ than the atoms from which they are formed.
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