Free Atomic Structure MCQs with Answers
922 Atomic Structure MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Atomic structure covers the discovery of the proton, Planck's quantum theory, hydrogen emission spectra and the evidence for quantized energy levels. You will use quantum numbers to describe orbitals, distinguish s, p, d and f orbital shapes, and write electronic configurations, including the correct order of electron filling.
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922 questions · page 34 of 47
- A. Greater than
- B. Smaller than
- C. Equal to
- D. Very close to
Explanation: The energy difference between the energy levels far away from the nucleus is smaller than the energy difference between the energy levels…
Correct answer: Smaller than- A. 1
- B. 3
- C. 5
- D. 7
Explanation: There are 5 distinct series of hydrogen spectrum: Lyman, Balmer, Paschen, Brackett, and Pfund.
Correct answer: 5- A. 1
- B. 2
- C. 4
- D. 5
Explanation: The value of ni in the Pfund series is 5. In the hydrogen spectrum, the Pfund series corresponds to electron transitions to and from the n…
Correct answer: 5- A. A
- B. B
- C. C
- D. D
Explanation: Moseley's law states that the frequency of the spectral lines in the characteristic X-ray spectrum is directly proportional to the square…
Correct answer: B- A. Degenerate
- B. Non degenerate
- C. Greater in number
- D. Smaller in size
Explanation: In the presence of magnetic field, the orbitals present in a sub-shell(which were degenerate)take up different orientations.
Correct answer: Non degenerate- A. rn2
- B. r/n
- C. rn
- D. r2n2
Explanation: The correct option is AAccording to Bohr's Model:r ∝n2/ZSo, radius of nth orbit is rn=rn2, as Z=1 for H atom.
Correct answer: rn2- A. 17
- B. 23
- C. 11
- D. 6
Explanation: To find the total number of electrons present in all the 'p' orbitals of the ground state of the element with atomic number 35, we need to…
Correct answer: 17- A. greater than electron
- B. greater than proton
- C. less than nitrogen ion
- D. greater than oxygen ion
Explanation: Explanation for this question will be added soon!
Correct answer: greater than oxygen ion- A. 10
- B. 15
- C. 12
- D. 18
Explanation: An atom with a valence configuration of 3p⁶ has all the available spaces in its p-subshell filled.
Correct answer: 10- A. 8
- B. 10
- C. 6
- D. 4
Explanation: The electronic configuration of 168O-2 is : 1s2,2s2,2p6 which shows that total four electrons are present in the s orbitals.
Correct answer: 4- A. Excited state
- B. Ground state
- C. Hybrid state
- D. molecular state
Explanation: According to the atomic number of the element,there must be 2 electrons in 2p subshell but one electron jumps from 2s subshell to 2p…
Correct answer: Excited state- A. Si+4
- B. S-2
- C. Cl-1
- D. K+1
Explanation: Electronic configuration of Si+4 is : 1s2,2s2,2p6.It has 6 electrons in p subshell while others have 12 and their electronic configuration…
Correct answer: Si+4- A. 8 in d subshell
- B. 2 in d subshell
- C. 6 in p subshell
- D. 3 in p-subshell
Explanation: The orbital diagram of the element with atomic number 15 is shown below which shows that it has 3 free electrons in p subshell.
Correct answer: 3 in p-subshell- A. 2
- B. 12
- C. 6
- D. 18
Explanation: The electronic configuration of Zinc (Zn) can be written as: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰.This electronic configuration shows that Zn has…
Correct answer: 12- A. Energy
- B. Radius
- C. Velocity
- D. Quantum number
Explanation: The equation E=hc/λ shows that wavelength and energy are inversely proportional.
Correct answer: Energy- A. 1
- B. 3
- C. 2
- D. 4
Explanation: no. of orbitals=n2 For L shell n=2 so 22=4 orbitals.
Correct answer: 4- A. 2
- B. 3
- C. 4
- D. 8
Explanation: Explanation for this question will be added soon!
Correct answer: 4- A. Copper
- B. Zinc
- C. Iron
- D. Chromium
Explanation: Zinc has ground state electronic configuration : [Ar]4s2,3d10.This electronic configuration shows that 3d subshell has 10 electrons.
Correct answer: Zinc- A. Cr
- B. V
- C. Fe
- D. Ti
Explanation: According to the given data in the question statement,the electronic configuration of the element is :1s2,2s2,2p6,3s2,3p6,4s2,3d6 and this…
Correct answer: Fe- A. 10
- B. 14
- C. 5
- D. 7
Explanation: d subshell has 5 orbitals and each orbital can accomodate only 2 electrons with opposite spins,therefore total 10 electrons can be…
Correct answer: 5