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 11 of 47
- A. 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d5
- B. 1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d5
- C. 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d6
- D. 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d3
- E. 1s2 , 2s2, 2p6, 3s2, 3p6, 4s2, 3d2
Explanation: Number of electrons in iron are 26,so the electronic configuration will be: 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d6.
Correct answer: 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d6- A. Velocity
- B. Intensity
- C. Frequency
- D. Polarization
Explanation: The penetrating power of X− rays depends upon their wavelength, which depends upon frequency.
Correct answer: Frequency- A. Hybrid orbitals
- B. Degenerate orbitals
- C. Valence orbitals
- D. Sub-orbitals
Explanation: Degenerate orbitals are the orbitals of the same subshell having equal energies.
Correct answer: Degenerate orbitals- A. Hydrogen
- B. Sodium
- C. Oxygen
- D. Li+
Explanation: The spectrum of an atom depends on the number of electrons present in it.
Correct answer: Li+205. When B- particles are sent through a thin metal foil, most of them go straight through the foil as:
- A. B- particles are much heavier than electrons
- B. B- particles are positively charged
- C. Most part of the atom is empty space
- D. B- particles move with high velocity
Explanation: They pass through tin metal foil because most space of the atom is empty, explained by Rutherford in his gold foil experiment.
Correct answer: Most part of the atom is empty space- A. Maximum energy
- B. Minimum energy
- C. Negative energy
- D. Positive energy
Explanation: The nucleus of an atom is surrounded by electrons that occupy shells or orbitals of varying energy levels.
Correct answer: Minimum energy- A. n=2, l=1
- B. n=1, l=2
- C. n=1, l=0
- D. n=2, l=0
Explanation: n(principal quantum number)= 2 because it is in second shell. l(azimuthal quantum number)=1 because l is fixed for subshells like for s it…
Correct answer: n=2, l=1- A. Goldstein
- B. Rutherford
- C. J.J Thomson
- D. Chadwick
Explanation: Thomson discovered electrons in 1897, Chadwick discovered neutrons in 1932 and Goldstein discovered canal ray in 1886.
Correct answer: Chadwick- A. 10
- B. 13
- C. 11
- D. 12
Explanation: Explanation: Nitric oxide has the formula NO. N is from group 5 and has 5 valence electrons while Oxygen is from Group 6 and has 6 valence…
Correct answer: 11- A. Lyman series
- B. Balmer series
- C. Paschen series
- D. Brackett series
- E. Pfund series
Explanation: Four of the Balmer lines are in the technically "visible" part of the spectrum, with wavelengths longer than 400 nm and shorter than 700…
Correct answer: Balmer series- A. 1
- B. 2
- C. 3
- D. 4
Explanation: This question has been repeated multiple times in other papers as well, hence this is a high-yield concept.
Correct answer: 2- A. 1s2, 2s2, 2px1, 2py1, 2pz1
- B. 1s2, 2s2, 2px2, 2pz1
- C. 1s2, 2s2, 2px2, 2py1
- D. 1s2, 2s2, 2py2, 2pz1
Explanation: The electronic configuration of nitrogen is as follows: 1s2, 2s2, 2p3. The 'Auf-bau principle' states that electrons fill lower-energy…
Correct answer: 1s2, 2s2, 2px1, 2py1, 2pz1- A. 200, lesser
- B. 300, lesser
- C. 300, greater
- D. 200, greater
Explanation: In gaseous state, the atoms are furthest apart so option A and B are wrong.
Correct answer: 300, greater- A. The nature of the electrode:
- B. The nature of the discharge tube
- C. The nature of the residual gas.
- D. The shape of the electrode
Explanation: The positive ions are created by gaseous discharge tube. The anode rays consists of ionized gas molecule, which even if had the same…
Correct answer: The nature of the residual gas.- A. X-ray analysis
- B. Spectrometry
- C. Infrared spectroscopy
- D. Refractometry
Explanation: X-ray analysis is the appropriate technique to be used to measure the atomic radius.
Correct answer: X-ray analysis- A. 5s
- B. 5d
- C. 4d
- D. 4f
Explanation: According to Aufbau's principle, the energy increases with increasing n+1 value as shown in the diagram:
Correct answer: 5d- A. -7
- B. 7
- C. 13
- D. -13
Explanation: The principal quantum number (n) is 5. The magnetic quantum number (l) for d is 2. Hence, n + l = ? 5 + 2 = 7
Correct answer: 7- A. 2
- B. 14
- C. 1
- D. 6
Explanation: An orbital has a maximum capacity of 2 electrons which does not change, it is a fact. So option A is chosen here.
Correct answer: 2- A. n = 2, l = 1
- B. n = 1, l = 2
- C. n = 1, l = 0
- D. n = 2, l = 2
Explanation: 'n' would be 2, as it is in the second shell. 'l' would be 1, as it is for p subshells.
Correct answer: n = 2, l = 1220. The probability of finding an electron between s-orbital is zero. This place is called the _ plane.
- A. Nodal
- B. Antinodal
- C. Non-nodal
- D. Erect
Explanation: An area where there is zero probability of finding an electron is known as node/nodal of wave function.
Correct answer: Nodal