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 14 of 47
- A. 1
- B. 3
- C. 5
- D. 7
Explanation: d-subshell has five degenerate orbitals with sausage shape.
Correct answer: 5- A. 5s>3d>3p>4s
- B. 3p>3d>5s>4s
- C. 5s>3d>4s>3p
- D. 3p>3d>4s>5s
Explanation: Option C is correct.The correct order of energy in the given subshells is 5s>3d>4s>3p.The energy of an electron subshell is determined by…
Correct answer: 5s>3d>4s>3p- A. Aufbau's principle
- B. Pauli's exclusion rule
- C. Hund's rule
- D. (n+/) rule
Explanation: Pauli's exclusion principle states that no two electrons in an atom can have the same set of four quantum numbers, and furthermore…
Correct answer: Pauli's exclusion rule- A. Is2, 2s2, 2p6, 3s2, 3p1
- B. Is2, 2s2, 2p6, 3s2, 3p3
- C. Is2, 2s2, 2p6, 3s1
- D. Is2, 2s2, 2p1
Explanation: This configuration accurately represents the electronic configuration of phosphorus (P).
Correct answer: Is2, 2s2, 2p6, 3s2, 3p3- A. Is2, 2s2, 2p1z, 2P1y, 2P1z
- B. Is2, 2s2, 2p2x, 2p2y, 2P1z,
- C. Is2, 2s1
- D. Is2, 2s2,2p2x, 2p0y, 2p0z
Explanation: Option D violates Hund's rule. According to Hund's rule, electrons preferentially occupy degenerate orbitals singly before pairing up.
Correct answer: Is2, 2s2,2p2x, 2p0y, 2p0z- A. [Ar]4s23d2xy3d2yz3d2xz3d2x2-y23d1z2
- B. [Ar]4s13d2xy3d2yz3d2xz3d2x2-y23d2z2
- C. [Ar]4s13d2xy3d2yz3d2xz3d2x2-y23d1z2
- D. [Ar]4s13d2xy3d2xz3d1x2-y23d1z2
Explanation: Electronic configuration of 29Cu = [Ar], 4s1, 3d10
Correct answer: [Ar]4s13d2xy3d2yz3d2xz3d2x2-y23d2z2- A. Principal
- B. Azimuthal
- C. Magnetic
- D. Both b & c
Explanation: Option C is correct , Magnetic quantum number has positive as well as negative value for its quantum number.
Correct answer: Magnetic- A. s
- B. l
- C. m
- D. n
Explanation: D is correct beacuse it shows the energy level of electrons , which is often referred as the energy of electron.
Correct answer: n- A. 0.5 x 10^-8 nm-1
- B. 10 nm-1
- C. 5 nm-1
- D. 100 nm-I
Explanation: Option Ais correct.The wave number (ν) of a radiation with wavelength λ = 2 x 10^8 nm will be 0.5 x 10^-8 nm^-1.
Correct answer: 0.5 x 10^-8 nm-1- A. Principal quantum number
- B. Azimuthal quantum number
- C. Spin quantum number
- D. Magnetic quantum number
Explanation: Option C is correct.Two electrons present in the same orbital can be distinguished by their spin quantum number.
Correct answer: Spin quantum number- A. 2p, 3d, 3s
- B. 3p, 3d, 5s
- C. 3s, 4p, 4d
- D. 5s, 4p, 3d
Explanation: Option D is correct.The set of orbitals having n + l = 5 are 5s, 4p, 3d.
Correct answer: 5s, 4p, 3d- A. n
- B. m
- C. l
- D. s
Explanation: Spin Quantum Number is not derived from Schrodinger's wave equation.
Correct answer: s- A. Positive
- B. Zero
- C. Negative
- D. Infinity
Explanation: correct option is B The energy of an electron is considered as zero at infinite distance from the nucleus as electron come nearer it gets…
Correct answer: Zero- A. Aufbau principle
- B. Pauli's exclusion principle
- C. Hund's rule
- D. Le chatilier principal
Explanation: Correct option is C Thus, nitrogen contains three unpaired electrons following Hund's rule of maximum multiplic According to this rule…
Correct answer: Hund's rule- A. IR rays
- B. X-rays
- C. UV-rays
- D. Cathode rays
Explanation: Cathode rays are not electromagnetic in nature, and are made of high speed electrons released from cathode.
Correct answer: Cathode rays- A. 3
- B. 4
- C. 6
- D. 8
Explanation: The electronic configuration of an element with atomic number 18 is given by: 2,8,8Hence, it is clear that there are 4 electron pairs (8…
Correct answer: 4- A. Effective volume of an orbital.
- B. Spatial orientation of an orbital.
- C. One-dimensional orientation of an orbital.
- D. Number of electrons in an orbital.
Explanation: In quantum mechanics, the magnetic quantum number (m) specifies the orientation or magnetic component of an atomic orbital within a given…
Correct answer: Spatial orientation of an orbital.- A. 1s2, 2s2, 2p3
- B. 1s2, 2s2, 2p6, 3s1
- C. 1s2,2s2,2p4
- D. 1s2, 2s2, 2p6, 3s2, 3p3
Explanation: Option A is correct. The given element in option A has highest ionization energy as it has half filled p orbital which is comparatively…
Correct answer: 1s2, 2s2, 2p3- A. Option A
- B. Option B
- C. Option C
- D. Option D
Explanation: n=3 represents the third energy level, l=3 indicates an f orbital, m=-3 means the f orbital is oriented in a specific direction, s=+1/2…
Correct answer: Option B- A. 8
- B. 13
- C. 12
- D. 14
Explanation: Electronic configuration of Atomic number 24 (Chromium) is :1s22s22p63s23p63d54s1 M-shell is the third shell, i.e.
Correct answer: 13