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.
Last updated
922 questions · page 24 of 47
- A. Energy
- B. Brightness
- C. Light
- D. Darkness
Explanation: Photon means light so wave packets are called photons.
Correct answer: Light- A. Shape
- B. Energy
- C. Position
- D. Both B and C.
Explanation: The principal quantum number determines the size of the orbit and the distance from the nucleus.
Correct answer: Both B and C.- A. Nodal
- B. Antinodal
- C. Non-nodal
- D. Errect
Explanation: An area where there is zero probability of finding an electron is known as node/nodal of wave function.
Correct answer: Nodal- A. Zero & Positive
- B. Non zero & Positive
- C. Non zero & Negative
- D. Positive
Explanation: The Principle Quantum Number denotes the principle shell to which the electron belongs.
Correct answer: Non zero & Positive- A. E=hcv
- B. E=c/v
- C. E = CV
- D. none of these
Explanation: Option A : The equation E=hcv shows the relationship between energy (E), Planck's constant (h), the speed of light (c), and the frequency…
Correct answer: none of these- A. n = 2
- B. n = 3
- C. n = 4
- D. n = 5
Explanation: Option A is wrong because n=2 will not be the higher orbit. Option B is wrong because n=3 will not be the higher orbit.
Correct answer: n = 4- A. 6f filled first
- B. 7s placed first
- C. 7s placed later
- D. 6f placed later
Explanation: The (n+l) rule corresponds to the Aufbau principle where n represents the quantum number and l represents the azimuthal number.
Correct answer: 7s placed first- A. Decrease
- B. Increase
- C. Remains the same
- D. Be constant
Explanation: After substituting the values, it can be seen that there is a general increase.
Correct answer: Increase- A. Freezed, continuous
- B. Freezed, line
- C. Volatilized, line
- D. Volatilized, continuous
Explanation: Option A: Freezed, continuous, is not correct because freezing a substance would solidify it, making it difficult to volatilize and…
Correct answer: Volatilized, line- A. s
- B. p
- C. s, p, d
- D. s, p, d, f
Explanation: If n=4n = 4n=4, it will contain the subshells with the following quantum numbers:4s (with l=0l = 0l=0, the angular momentum quantum…
Correct answer: s, p, d, f471. Electrons can revolve only in those orbits having _-angular momentum which depends on its _ number.
- A. variable, quantum
- B. fixed, principal
- C. fixed, quantum
- D. variable, principal
Explanation: The electron can revolve only in those orbits having fixed angular momentum which depends on its quantum number.
Correct answer: fixed, quantum- A. Aufbau principle
- B. Pauli exclusion principle
- C. Hund's rule
- D. None of these
Explanation: Pauli's exclusion principle states that no two electrons in the same atom can have identical values for all four of their quantum numbers.
Correct answer: Pauli exclusion principle- A. Shape
- B. Energy
- C. Position
- D. All of these
Explanation: Quantum numbers specify different properties of electrons in an atom. Specifically, the four quantum numbers (principal, azimuthal…
Correct answer: All of these- A. Energy of electron
- B. Location of electron
- C. Shells or energy levels
- D. All of these
Explanation: Principle quantum number helps us find all of the above things
Correct answer: All of these- A. Chadwick,1895
- B. Goldstein,1886
- C. Rutherford,1885
- D. J.Perrin,1885
Explanation: Option B is correct as Eugene "Goldstein" discovered positive particles by using a tube filled with hydrogen gas.
Correct answer: Goldstein,1886- A. One
- B. Two
- C. Three
- D. Five
Explanation: Option D is correct as the subshell with l=2 is the d subshell with "5" orbitals.
Correct answer: Five- A. Flat
- B. Round
- C. Perforated
- D. Oval
Explanation: Perforated" is the correct answer. In the discharge tube experiment, a cathode with a small hole or perforation is used to allow the…
Correct answer: Perforated- A. Plank.
- B. Heisenberg.
- C. Schrodinger.
- D. All of these.
Explanation: Quantum numbers are a set of numerical values that describe the properties of electrons in an atom.
Correct answer: Schrodinger.- A. Gas.
- B. Air.
- C. Vapours of a substance.
- D. All of these.
Explanation: The discharge tube can be filled with air. It can also be filled with the vapor of a substance, such as mercury vapor, in addition to gas…
Correct answer: All of these.- A. 24
- B. 5
- C. 72
- D. 98
Explanation: The formulae/expression 2n2 can be/was derived from the number of orbitals present in each of the main energy levels.
Correct answer: 98