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 43 of 47
- A. Hund's rule
- B. Aufbau principle
- C. Pauli's exclusion principle
- D. All of the above options are correct
Explanation: The Pauli Exclusion Principle states that, in an atom or molecule, no two electrons can have the same four electronic quantum numbers.
Correct answer: Pauli's exclusion principle- A. Magnetic quantum number
- B. Spin quantum number
- C. Azimuthal quantum number
- D. Principle quantum number
Explanation: The Azimuthal quantum number (l) describes the shape of the orbital.
Correct answer: Azimuthal quantum number- A. n
- B. l
- C. m
- D. s
Explanation: The angular momentum quantum number determines the shape of the orbital.
Correct answer: l844. If value of azimuthal quantum number is 2 then total values of magnetic qunatum number will be:
- A. 03
- B. 05
- C. 07
- D. 10
Explanation: Option B shows the correct value of magnetic quantum number when azimuthal quantum number is 2, the m value is: -2, -1 , 0 , +1 , +2
Correct answer: 05- A. Principal Quantum Number
- B. Spin Quantum Number
- C. Azimuthal Quantum Number
- D. Magnetic Quantum Number
Explanation: Spin quantum number is not explained through schrodinger's wave equation, whereas all other quantum number are explained according to that.
Correct answer: Spin Quantum Number846. If uncertainty in the momentum of electron is zero, the uncertainty in its position would be _?
- A. Less than zero
- B. more than zero
- C. one
- D. infinite
Explanation: The uncertainty principle, as described by Heisenberg, states that it is impossible to know both the exact position and momentum of a…
Correct answer: infinite- A. The energy of an electron
- B. The location of an electron
- C. The size of an orbital
- D. All of these
Explanation: The principal quantum numbers tells us about, energy level, location of electrons as well as size of orbital.
Correct answer: All of these- A. Less than zero
- B. More than zero
- C. One
- D. Infinite
Explanation: According to Heisenberg's uncertainty principle, the more precisely the momentum of an electron is known, the more uncertainty there is in…
Correct answer: Infinite- A. Nucleus
- B. Atom
- C. Orbital
- D. Nodal plane
Explanation: OPTION A: The nucleus of an atom is the central region of an atom where the majority of the mass is concentrated.
Correct answer: Orbital- A. Nucleus
- B. Atom
- C. Orbital
- D. Nodal plane
Explanation: An orbital is a three dimensional description of the most likely location of an electron around an atom.
Correct answer: Orbital- A. Nucleus
- B. Atom
- C. Orbital
- D. Nodal plane
Explanation: The 'Nodal plane' is a region around the nucleus of an atom, where the probability of coming across an electron is zero or nigh zero.
Correct answer: Nodal plane- A. Nucleus.
- B. Atom.
- C. Orbital.
- D. Nodal Plane.
Explanation: The region where the probability of finding electrons is maximum is called the orbital.
Correct answer: Orbital.- A. Nodal
- B. Antinodal
- C. Non nodal
- D. Erect
Explanation: "Nodal" plane is a plane that passes through a nucleus where the probability of finding an electron between s-orbital is zero.
Correct answer: Nodal- A. First two
- B. First three
- C. In all axis
- D. None of these
Explanation: The lobes of the d-orbitals lie between the x, y , and z-axis hence the first three-axis so the answer is B.
Correct answer: First three- A. Spherical
- B. Dumbbell
- C. Complicated
- D. All of these
Explanation: When the angular quantum number is equal to 2, the shape of the orbital gets cloverleaf or we can say it gets complicated in shape.
Correct answer: Complicated- A. Lyman
- B. Paschen
- C. Brackett
- D. Pfund
- E. Balmer
Explanation: The explanation for this question will be added soon.
Correct answer: Balmer- A. Shells
- B. Energy levels
- C. Sub shells
- D. All of these options are correct
Explanation: A. Shells (Incorrect): Fine lines in a line spectrum are indicative of transitions between energy levels within an atom, not the presence…
Correct answer: Sub shells- A. 10-8 m
- B. 10-1 m
- C. 10-11 m
- D. 10-13 m
Explanation: The radius of an electron orbit in a hydrogen atom, as estimated by the Bohr model, is approximately 0.529 angstroms.
Correct answer: 10-11 m- A. Shells
- B. Energy Levels
- C. Subshells
- D. All of these
Explanation: Option A is incorrect because electrons can't jump between "shells". Option B is incorrect because the line spectrum is caused by the…
Correct answer: Subshells- A. Balmer
- B. Pfund
- C. Paschen
- D. none of these
Explanation: When the electron series terminates at 4th orbit, the 'Bracket series' is obtained.
Correct answer: none of these