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 39 of 47
- A. Zeeman's effect
- B. Stark's effect
- C. Compton effect
- D. Photo electric effect
Explanation: The splitting of spectral lines when an atom is subjected to a magnetic field is known as the Zeeman effect.
Correct answer: Zeeman's effect- A. 10 tor
- B. 1 tor
- C. 0.1 tor
- D. 0.01 tor
Explanation: In gas discharge tubes, low pressures are maintained. A common pressure range is around 1 torr.
Correct answer: 1 tor- A. Neutrino
- B. Electron
- C. Both a and b
- D. Meson
Explanation: A free neutron can change into a proton with the emission of an electron.
Correct answer: Electron- A. 1.76 x 10^11 C/kg
- B. 11.76 x 10^11 C/kg
- C. 1.76 x 10^-11 C/kg
Explanation: The value of the charge-to-mass ratio (e/m) of an electron is approximately 1.76×1011 C/kg
Correct answer: 1.76 x 10^11 C/kg- A. Gamma-rays
- B. Aplha -rays
- C. Beta-rays
- D. X-rays
Explanation: Rutherford's famous gold foil experiment, conducted in 1909, involved bombarding alpha particles at a thin gold foil.
Correct answer: Aplha -rays- A. 1s22s22p63s23p64s23d9
- B. 1s22s22p63s25p64s23d7
- C. 1s22s12p23s23p64s23d9
- D. 1s22s22p63s23p64s
Explanation: Copper has an unusual electronic configuration in its ground state. Instead of filling the 4s orbital completely before moving to the 3d…
Correct answer: 1s22s22p63s23p64s23d9- A. Shorter wavelength
- B. Larger wavelength
- C. X-rays not produced
- D. All are possible
Explanation: In general, X-rays produced by an atom with a higher atomic number have shorter wavelengths.
Correct answer: Shorter wavelength- A. Moseley
- B. Davission and Germer
- C. Einstein
- D. Roentgen
Explanation: Through their famous Davisson-Germer experiment. They demonstrated the wave-like properties of electrons through the diffraction of…
Correct answer: Davission and Germer- A. 1s22s22p63s23p64s1
- B. 1s22s23p63s23p24s2
Explanation: The principal quantum number (n) is the quantum number that primarily determines the energy level of an electron in an atom
Correct answer: 1s22s22p63s23p64s1- A. de-Broglie
- B. Planck's
- C. Schrodinger
- D. Heisenberg
Explanation: The three quantum numbers (principal quantum number, azimuthal quantum number, and magnetic quantum number) have been derived from the…
Correct answer: Schrodinger- A. Ice
- B. Carbon (diamond)
- C. Sucrose
- D. Plastic
Explanation: Crystalline substances have a well-defined, repeating three-dimensional arrangement of atoms, ions, or molecules.Plastic: Plastic is a…
Correct answer: Plastic- A. Auf bau principle
- B. Hund's rule
- C. Pauli's Exclusion principle
- D. All
Explanation: Molecular orbitals are filled according to (d) All of the given principles: Aufbau principle, Pauli's Exclusion principle, and Hund's…
Correct answer: All- A. At infinity, the electron is not attracted by nucleus and potential energy is zero
- B. At a point, near the nucleus, its potential energy is less than zero
- C. With the increase of n-value the potential energy increases
- D. All of the above
Explanation: Since options (A), (B), and (C) are all correct statements regarding the potential energy of an electron in an atom under different…
Correct answer: All of the above- A. In the yz plane
- B. In the xy plane
- C. In the y-direction
- D. In the z-direction
Explanation: The pₓ orbital is oriented along the x-axis. The yz plane is a nodal plane for this orbital, meaning it is a plane where the probability…
Correct answer: In the yz plane- A. n=4, l=3, m=3, s=+1/2 or -1
- B. n=3, l=3, m==3, s=+1/2 or -1/2
- C. n=4, l=3, m==3, s=+1/2 or -1/2
- D. =3, l=1, m==0, s=+1/2 or -1/2
Explanation: n=3 represents the third energy level, l=3 indicates an f orbital, m=-3 means the f orbital is oriented in a specific direction, s=+1/2…
Correct answer: n=3, l=3, m==3, s=+1/2 or -1/2- A. n=2,l = 1
- B. n=2, l= 2
- C. n=2, l=0
- D. n=1, l = 0
Explanation: There are two types of quantum numbers: azimuthal quantum number(l) and principal quantum number(n).
Correct answer: n=2,l = 1- A. Faraday's experiments proved the existence of electrons
- B. Crookes tube experiment demonstrated the presence of electrons in the atoms
- C. Radioactivity directly confirms the presence of electrons and protons
- D. Chadwick's experiment confirmed the presence of neutrons
Explanation: Option D is correct. James Chadwick's experiment involving the bombardment of beryllium with alpha particles led to the discovery of…
Correct answer: Chadwick's experiment confirmed the presence of neutrons- A. 0.2m
- B. 0.2 nm
- C. 2 x 10^-19nm
- D. 0.2 pm
Explanation: The diameter of an atom is 0.2nm. PTB-Pg 2
Correct answer: 0.2 nm- A. [Ar] 4s2
- B. [Ar] 4s1
- C. [Kr] 4s1
- D. [He] 4s1
Explanation: The Potassium electron configuration will be 1s22s22p63s23p64s1. The electronic configuration of Argon is 1s22s22p63s23p6
Correct answer: [Ar] 4s1- A. 4s<3s<2s3s>2s>ls
- B. 4s>3s> 2s> 1s
- C. Constant
- D. None of these
Explanation: The s subshell has 1 orbital that can hold up to 2 electrons, the p subshell has 3 orbitals that can hold up to 6 electrons, the d…
Correct answer: 4s>3s> 2s> 1s