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 7 of 47
- A. 1
- B. 3
- C. 5
- D. 7
Explanation: For azimuthal quantum number l = 3, the magnetic quantum number m can have seven values: -3, -2, -1, 0, +1, +2 and +3.
Correct answer: 7- A. Principal
- B. Azimuthal
- C. Magnetic
- D. Spin
Explanation: The letters s, p, d and f represent subshells identified by the azimuthal quantum number, l.
Correct answer: Azimuthal- A. de-Broglie
- B. Plancks
- C. Schrodinger
- D. Heisenberg
Explanation: Solving Schrödinger's wave equation for an electron gives the principal, azimuthal and magnetic quantum numbers, which describe its energy…
Correct answer: Schrodinger- A. Degenerate orbitals
- B. Bonding molecular orbitals
- C. Anti bonding molecular orbitals
- D. Half filled orbitals
Explanation: Orbitals having the same energy are called degenerate orbitals, such as the three p orbitals in an isolated atom.
Correct answer: Degenerate orbitals- A. 6
- B. 10
- C. 14
- D. 18
Explanation: For l = 3, the subshell is an f subshell and it contains 2l + 1 = 2(3) + 1 = 7 orbitals.
Correct answer: 14126. The magnetic quantum number (QN) has its values determined directly by the value of_______________?
- A. Principal (QN)
- B. Azimuthal (QN)
- C. Spin (QN)
- D. Both A & B
Explanation: The magnetic quantum number, m_l, has values from -l to +l, so its possible values are directly determined by the azimuthal quantum number…
Correct answer: Azimuthal (QN)- A. Plancks theory
- B. Dual nature of matter
- C. Heisenbergs uncertainty principle
- D. All of these
Explanation: Bohr's model assigns an electron a definite circular orbit, but Heisenberg's uncertainty principle states that exact position and momentum…
Correct answer: Heisenbergs uncertainty principle- A. n=3 l=2
- B. n=3 l=0
- C. n=3 l=1
- D. n=3 l=3
Explanation: A p subshell always has the azimuthal quantum number l = 1, and the number 3 indicates the principal quantum number n = 3.
Correct answer: n=3 l=1- A. 6
- B. 4
- C. 3
- D. 2
Explanation: An orbital is specified by one value of the magnetic quantum number, m, and any one orbital can contain a maximum of two electrons with…
Correct answer: 2- A. mono dentate
- B. Bi dentate
- C. tri dentate
- D. Poly dentate
Explanation: Ethylenediamine, H2NCH2CH2NH2, has two nitrogen donor atoms, and each nitrogen can donate a lone pair to the same metal ion.
Correct answer: Bi dentate- A. S
- B. P
- C. d
- D. f
Explanation: An s orbital has the greatest penetration because its electron-density distribution allows it to approach the nucleus most closely.
Correct answer: S- A. Orbital
- B. Orbit is elliptical
- C. subshell
- D. Electron cloud
Explanation: An orbital is a region around the nucleus where the probability of finding an electron is high.
Correct answer: Orbital- A. Principal of quantum number
- B. Azimuthal quantum number
- C. Magnetic quantum number
- D. Spin quantum number
Explanation: The azimuthal quantum number, l, determines the subshell and therefore the shape of an orbital: s is spherical, p is dumbbell-shaped, and…
Correct answer: Azimuthal quantum number- A. Atomicity
- B. Shape of molecule
- C. Both A and B
- D. Difficult to predict
Explanation: Molecular size is affected by the number of atoms present, called atomicity, and by how those atoms are arranged in space.
Correct answer: Both A and B- A. 10.54ev
- B. 12.54ev
- C. 13.6ev
- D. 17.56ev
Explanation: Removing the electron from ground-state hydrogen requires 13.6 eV per atom because hydrogen's ground-state energy is -13.6 eV and…
Correct answer: 13.6ev- A. Alpha radiations
- B. Gamma radiations
- C. Beta radiations
- D. positron
Explanation: Beta radiation consists mainly of high-speed electrons, so it carries a negative charge.
Correct answer: Beta radiations- A. Alpha radiations
- B. Gamma radiations
- C. Beta radiations
- D. AOT
Explanation: Gamma radiation travels at the speed of light in vacuum, about 3.0 x 10^8 m/s, whereas alpha and beta particles travel below this speed…
Correct answer: Gamma radiations- A. visible radiation
- B. Ultra violet radiation
- C. Infrared radiation
- D. Gamma rays
Explanation: Ultraviolet radiation supplies the energy needed to split oxygen molecules into oxygen atoms, which then combine with O2 to form ozone…
Correct answer: Ultra violet radiation- A. 1000 to 300 A°
- B. 3800 to 7600 A°
- C. 8000 to 10,000 A°
- D. 12,000 to 15,000 A°
Explanation: Visible light has wavelengths of approximately 3800 to 7600 Å, equivalent to 380 to 760 nm.
Correct answer: 3800 to 7600 A°- A. Orbit is cylindrical
- B. Orbit is elliptical
- C. Orbit is longitudinal
- D. Orbit is asymmetrical
Explanation: Sommerfeld extended Bohr’s circular-orbit model by allowing electrons to move in elliptical as well as circular orbits, helping explain…
Correct answer: Orbit is elliptical