Atomic Structure MCQs for MDCAT Practice

Chemistry section, Atomic Structure chapter. Sample questions from past PMC papers.

1. Question 1
   The electronic configurations of the noble gases are:
   • A.ns2, np5
   • B.ns2, np6
   • C.ns2, np4 , nd8
   • D.ns2, np5, nd10
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2. Question 2
   The mass of one mole of electron is
   • A.1.8 mg
   • B.0.184mg
   • C.0.54 mg
   • D.64 mg
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3. Question 3
   Elements in the same vertical group of the periodic table have same
   • A.Number of electrons
   • B.Atomic number
   • C.Number of valence electrons
   • D.Electronic configurations
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4. Question 4
   Which of the following series of elements is listed in order of increasing atomic radius?
   • A.Na, Mg, Al, Si
   • B.C, N O, F
   • C.I, Br, Cl, F
   • D.O, S, Se, Te
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5. Question 5
   which rule violated in following configuration 1s2 2s2 2p6 3s2 3p6 4s3
   • A.Aufbau
   • B.N+L rule
   • C.Hund's rule
   • D.Pauli's exclusion principle
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6. Question 6
   Consider the element with atomic number 24. If we strictly followed the (n+l) rule without considering orbital stability, the outer electronic configuration would be:
   • A.3d5 4s1
   • B.3d4 4s2
   • C.3d6 4s0
   • D.4s2 3d4
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7. Question 7
   The radius of the third Bohr orbit is:
   • A.0.529 Å
   • B.0.529 / 4 Å
   • C.0.529 x 2 Å
   • D.0.529 x 32 Å
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8. Question 8
   Which light colour has the longest wavelength?
   • A.Violet
   • B.Blue
   • C.Red
   • D.Green
   • E.Yellow
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