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 46 of 47
- A. hv
- B. ½ mv^2
- C. Mgh
- D. Mc^2
Explanation: The emission or absorption of energy by an atom is represented by: ∆E = hυ Where '∆E' is the energy difference between the initial and…
Correct answer: hv- A. +1, 0, -1
- B. 0, +1, +2
- C. -1, 0, +1
- D. 0, -1, +1
Explanation: The Magnetic Quantum Number (m) specifies the orientation in space of an orbital of a given energy (n) and shape (l).
Correct answer: -1, 0, +1- A. Apax-h
- B. AEA-h
- C. both (a) and (b)
- D. None
Explanation: The uncertainty principle arises from the wave-particle duality.A quite accurate measurement of one observable involves a relatively large…
Correct answer: both (a) and (b)- A. ±3
- B. ±1/2
- C. ±2
- D. Any positive number from 0 to -1
Explanation: n = 3, so possible l = 0, 1, 2For each l, m = -l to +lSo:l = 0 → m = 0l = 1 → m = -1, 0, +1l = 2 → m = -2, -1, 0, +1, +2✅ Range of m: -2…
Correct answer: ±2- A. 4
- B. 3
- C. 5
- D. 9
Explanation: This option is correct. The n=3 shell has three subshells corresponding to l=0, l=1, and l=2.
Correct answer: 3- A. 4
- B. 5
- C. 6
- D. 9
Explanation: 'n' is referred to as the principal quantum number and 'l' is the azimuthal quantum number.
Correct answer: 9- A. mvr = nh
- B. mvr = nh/2π
- C. mvr = n/2π
- D. mvr = nh/π
Explanation: The correct relationship for the angular momentum of an electron in a hydrogen atom according to Bohr's atomic theory is mvr = nh/2π…
Correct answer: mvr = nh/2π- A. 12C
- B. 15N
- C. 16O
- D. 32S
Explanation: The spin is a quality of particles, it tells us the angular momentum (½) of an electron of a substance.
Correct answer: 15N- A. 3
- B. 6
- C. 5
- D. 7
Explanation: The principal quantum number (n) determines the number of sublevels in a given energy level.
Correct answer: 5- A. 1.6
- B. 1.3
- C. 3.1
- D. 6.1
Explanation: The electronic configuration of chlorine is [Ne]3s23p5, indicating that the last electron is in the 3p subshell.
Correct answer: 3.1- A. 1
- B. 3
- C. 5
- D. 7
Explanation: For the sub-shell with n-4 and l=3, the number of orientations is 7. This is because the number of orientations is given by 2l + 1.
Correct answer: 7- A. Negative (-Ve)
- B. Positive (+Ve)
- C. Zero
- D. None
Explanation: In the hydrogen atom, the force we are primarily referring to is the attractive force acting between the nucleus and the electron and this…
Correct answer: Negative (-Ve)913. The ionization energy of a hydrogen atom is 13.6 ev. The ionization potential required will be:
- A. 4.9 volt
- B. 8.5 * 10-10 volt
- C. 3.4 volt
- D. 13.6 volt
Explanation: The ionization energy of a hydrogen atom is the energy required to remove an electron from the atom.
Correct answer: 13.6 volt- A. Zero
- B. Negative
- C. Positive
- D. None of the above
Explanation: The energy of a hydrogen atom in its ground state is negative, approximately -13.6 eV.
Correct answer: Negative- A. -13.6eV
- B. -3.4eV
- C. -0.85eV
- D. -1.5eV
Explanation: The energy of an electron in the excited state with n=4 in a hydrogen atom can be calculated by using the formula for the energy levels of…
Correct answer: -0.85eV916. If an atom exists in the excited state n = 5, the maximum number of transitions that take place are:
- A. 6
- B. 5
- C. 10
- D. 3
Explanation: To solve such a question, here's an amazing trick! We know that n is 5. Step 1: From the 'n' value, start counting backwards. i.e.
Correct answer: 10- A. 2 times
- B. 3 times
- C. 4 times
- D. 5 times
Explanation: Since r = n^2 (0.053nm) When n = 1 r1 = 0.053nm When n = 2 r2 = 2^2 (r1) r2 = 4 r1 An increase in the radius of orbit when an electron…
Correct answer: 3 times- A. 13.6 eV
- B. 1.36 eV
- C. 10.2 eV
- D. 4.3 eV
Explanation: The ionization potential of a hydrogen atom is 13.6 eV, which is the energy needed to completely remove the electron from the nucleus when…
Correct answer: 13.6 eV- A. Increases with increasing energy
- B. Decreases with increasing energy
- C. First increases and then decreases with increasing energy
- D. First decreases and then increases with increasing energy
Explanation: As energy levels increase, the energy difference between adjacent ones decreases due to the trend of decreasing energy from the energy…
Correct answer: Decreases with increasing energy- A. 1.51 eV
- B. 3.4 eV
- C. 13.6 eV
- D. 12.1 eV
Explanation: The energy required to ionize a hydrogen atom from a given state is the difference between the energy of that state and the energy of the…
Correct answer: 1.51 eV