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 13 of 47
- A. P-3
- B. Si-4
- C. S-2
- D. All of these
Explanation: The correct option is d) All of these. Isoelectronic species are atoms or ions that have the same number of electrons.
Correct answer: All of these- A. n=4, ℓ=0, m=0, s=+ ½
- B. n=3, ℓ=2, m=0, s=+½
- C. n=4, ℓ =1, m=0, s=+½
- D. n=3, ℓ=0, m=0, s=+½
Explanation: The correct option is a) n=4, ℓ=0, m=0, s=+½. The quantum numbers provide specific information about the electron's energy level, orbital…
Correct answer: n=4, ℓ=0, m=0, s=+ ½- A. Principal
- B. Azimuthal
- C. Magnetic
- D. Spin
Explanation: Quantum number which is not derived from Schrodinger wave equation is spin quantum number. It was given by Uhlenbeck and Goudsmith.
Correct answer: Spin- 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. [ Ar]4s'3d8
- B. [Ar]4s'3d54s2
- C. [Ar]3d104s1
- D. [Ar]3d10
Explanation: The electronic configuration of Cu is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d¹⁰.When Copper loses one electron to form Cu+1 ion, it loses the 4s¹…
Correct answer: [Ar]3d10246. For p-sub shell:
- A. l=0, m=0
- B. I = 2, m = 0,±1, ±2
- C. l= 1, m =0,± 1
- D. l=3, m=0,±1, ±2,±3
Explanation: For p subshell the value of azimuthal quantun number (l)= 1 and value of magnetic quantum number (m)=0, ± 1 (3 values as p subshell has 3…
Correct answer: l= 1, m =0,± 1- A. r2
- B. 1/r
- C. √r
- D. 1/√ r
Explanation: From Bohr's Model, Centripetal force of electron = Columbic force of attraction on electron by nucleus.
Correct answer: √r- A. One
- B. Two
- C. Three
- D. Infinite
Explanation: Total Nodes=n-1and Radial Nodes = n - 1 - ℓSo, for 3Px n = 3 and ℓ = 1So, the number of radial nodes = 3 - 1 -1 = 1
Correct answer: One- A. β − particles scattering beyond the gold foil.
- B. Majority of β − particles passing undeflected through the foil.
- C. Very few β − particles getting absorbed.
- D. Wave nature of electron
Explanation: β- particles will converge while passing through atom as they bear negative charge.
Correct answer: β − particles scattering beyond the gold foil.- A. in yz plane
- B. in xy plane
- C. in the y-direction.
- D. in the z-direction.
Explanation: The yz plane is a two-dimensional plane formed by the y-axis and z-axis.
Correct answer: in yz plane- A. 5.28 x 10^-27m
- B. 7.28 x 10^-7m
- C. 2 x 10^-10m
- D. 3 x 10^-5m
Explanation: The de Broglie wavelength (λ) of a particle is given by the formula λ = h / p, where h is the Planck constant and p is the momentum of the…
Correct answer: 7.28 x 10^-7m- A. n =1 to n = 3
- B. n = 2 to n = 3
- C. n = 4 to n = 6
- D. n= 3 to n = 4
Explanation: Transition from n = 4 to n = 6 involves the largest energy change, resulting in the absorption of a photon with the lowest frequency and…
Correct answer: n = 4 to n = 6- A. x/9
- B. x/3
- C. 3x
- D. 9x
Explanation: According to Bohr's model, the speed of an electron in an orbit is inversely proportional to the principal quantum number (n).
Correct answer: x/3- A. n=2, l=1, m=0, s=1/ 2
- B. n=4, l=3, m=1, s=+1/2
- C. n=5, l=3, m=2, s=+1/2
- D. n=3, l=2, m=3, s=+1/2
Explanation: If the angular momentum quantum number of an electron =3, which means (n-1) values are possible for l, so the possible values of l =…
Correct answer: n=3, l=2, m=3, s=+1/2- A. 3, 2, - 2, 1/2
- B. 3,3,1,-1/2
- C. 0,3,1,-1/2
- D. 3,1,1,-1/2
Explanation: n = l is not permissible.Value of l is always less than the value of n.
Correct answer: 3,3,1,-1/2- A. size, orientation and shape
- B. size, shape and orientation
- C. shape, size and orientation
- D. none of these
Explanation: Principal, azimuthal and magnetic quantum numbers are respectively related to size,shape and orientationHence, (B) is the correct answer.
Correct answer: size, shape and orientation- A. In continuous manner
- B. In discontinuous manner
- C. Simultaneously
- D. In the form of heat
Explanation: According to Planck's quantum theory, there is no continuous emission or absorption of energy.
Correct answer: In discontinuous manner- A. Lower
- B. Higher
- C. Equal
- D. Variable orbit to orbit
Explanation: Note: Energy of subshell α(n+ ℓ), Energy order s<p<d< I The correct option is b) Higher.
Correct answer: Higher- A. n=5, ℓ=3, m=+1
- B. n=5, ℓ=2, m=+2
- C. n=4, ℓ =3, m=0
- D. n=4, ℓ=0, m=+1
Explanation: The correct option is a) n=5, ℓ=3, m=+1. The energy of an electron in an atom depends on its principal quantum number (n), azimuthal…
Correct answer: n=5, ℓ=3, m=+1- A. 2
- B. 6
- C. 10
- D. 14
Explanation: Note: Number of electrons in a subshell = 2(2ℓ + 1). The correct option is b) 6. The p-subshell can accommodate a maximum of 6 electrons.
Correct answer: 6