Free Atomic Structure MCQs with Answers

• A. 3
• B. 2
• C. 1
• D. 4

Explanation: Boron (B) has an atomic number of 5. In the L shell, the 2s subshell can hold a maximum of 2 electrons, and the 2p subshell can hold a…

• A. 3s, 3p
• B. 4s, 3d
• C. 3s, 3d
• D. 4s, 3p

Explanation: The full electronic configuration in order of increasing energy is as follows: 1s2, 2s2, 2p6, 3s2, 3p6, 4s1 The correct option according…

• A. Sr2+
• B. Kr
• C. Se4+
• D. Br-1

Explanation: Isoelectronic species have the same number of electrons. Sr2+ (36 electrons), Kr (36 electrons), and Br- (36 electrons) all have 36…

• A. 2
• B. 14
• C. 10
• D. 6

Explanation: p subshell has 3 orbit and 1 orbit has maximum 2 electrons.

• A. Ground state
• B. Excited state
• C. Hybridized state
• D. Molecular state

Explanation: This configuration represents ground state electronic configuration of nitrogen atom

• A. E= hcv
• B. E= c/v
• C. E= cv
• D. None of these

Explanation: Planck's quantum theory is fundamentally characterized by the equation E = hv, where E is the energy of a photon, h is Planck's constant…

• A. Photon
• B. Wavelength
• C. Frequency
• D. Velocity

Explanation: According to E = hf, it can be seen that 'E' (energy of quantum) is directly proportional to 'f' (frequency).

• A. n
• B. m
• C. s
• D. I

Explanation: The shape of an orbital is described by the azimuthal quantum number or orbital angular momentum quantum number (l).

• A. 5p
• B. 5d
• C. 5s
• D. 5f

Explanation: Quantum numbers are the basis of the sequence, arrangement, shape, and orientation of the elements in periodic table.

• A. 2 (2l - 1)
• B. 2 (2l + 1)
• C. 2(l + 1)
• D. 2l + 1

Explanation: The maximum number of electrons in a subshell is given by the formula 2n², where "n" represents the principal quantum number of the…

• A. Electron
• B. Electronic cloud
• C. Proton cloud
• D. Energy

Explanation: This answer is incorrect because electrons are indeed already present within orbitals, using "electron" as an alternative name for…

• A. Field
• B. Axis
• C. Zone
• D. Atomic orbital

Explanation: This answer is incorrect because the term "field" often refers to a region in which a physical quantity, such as an electric or magnetic…

• A. 99%
• B. 94%
• C. 95%
• D. 80%

Explanation: This answer is incorrect because, The chance of finding an electron in a specific region within an atom is not described as a fixed…

• A. 1
• B. 2
• C. 3
• D. 4

Explanation: Each orbital holds two electrons which differ in a property known as spin. In other words, an orbital is an area where the electrons live.

• A. 0.56nm
• B. 0.053nm
• C. 0.09nm
• D. 0.098nm

Explanation: The probability of finding an electron in a hydrogen atom is not precisely at 0.56nm because the the specific shape of the probability…

• A. Lyman series
• B. Balmer series
• C. Paschen series
• D. Brackett series
• E. Pfund series

Explanation: Four of the Balmer lines are in the technically "visible" part of the spectrum, with wavelengths longer than 400 nm and shorter than 700…

• A. Lymen series
• B. Balmer Series
• C. Paschen series
• D. Bracket series
• E. Pfund series

Explanation: Lyman series of hydrogen atom lies in ultraviolet region, Balmer series lies in visible region while Pfund and Paschen series lie in…

• A. 2 𝜋 x
• B. 6 𝜋 x
• C. 9 x
• D. x / 3

Explanation: The radius of the first Bohr orbit is x, then the de-Broglie wavelength of electrons in the 3rd orbit is near:λ=3×2πx=6 πx (n=3)

• A. 11097 A
• B. 18750 A
• C. 17884 A
• D. 19001 A

Explanation: Option B is correct according to the calculations.

• A. 1.0974 nm
• B. 4 nm
• C. 364.6 nm
• D. 3.64 m
• E. 480 nm

Explanation: Attached below is the solution to the question above: