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 44 of 47
- A. Balmer
- B. Pfund
- C. Paschen
- D. None of these options are correct
Explanation: None of these options are correct. When an electron series terminates on the 4th orbit, it corresponds to the Lyman series.
Correct answer: None of these options are correct- A. Shells
- B. Energy levels
- C. Sub shells
- D. All of these
Explanation: Presence of subshells is shown by several fine lines on the line spectrum.
Correct answer: Sub shells863. In atomic particles:
- A. Mass of neutron is almost equal to mass of electron
- B. e/m of a proton is almost equal to e/m of electron
- C. Mass of proton is almost equal to mass of electron
- D. Charge of proton is almost equal to charge of electron
Explanation: Explanation:Both protons and electrons have the same charge in the atomic particles. Hence, the correct answer is D.
Correct answer: Charge of proton is almost equal to charge of electron- A. 1.7588 x 10^-11
- B. 1.7588 x 10^11
- C. 1.602 x 10^-19
- D. 1.7588 x 10^8
Explanation: A is incorrect as given value is not charge of one gram of electrons.B is incorrect as given value is charge of one kilogram of…
Correct answer: 1.7588 x 10^8- A. 1.7588 x 10^-11
- B. 1.7588 x 10^11
- C. 1.602 x 10^-19
- D. 1.7588 x 10^8
Explanation: We know 1 electron has a mass of 9.1x10²⁸g So 1g of electrons have how many number of electrons in it ?
Correct answer: 1.7588 x 10^8- A. Increases.
- B. Decreases.
- C. Remains constant.
- D. Decreases then increases.
Explanation: Paramagnetism is due to the presence of unpaired electrons in the material, so most atoms with incompletely filled atomic orbitals are…
Correct answer: Increases.- A. 1s2,2s2,2p6,3s2,3p6,3d3
- B. 1s2,2s2,2p6,3s2,3p6,4s2,3d1
- C. 1s2,2s2,2p6,3s2,3p6,4s2,4p1
- D. 1s2,2s2,2p6,3s2,3p6,4s1,4p2
Explanation: The electronic configuration for Sc is 1s2, 2s2, 2p6, 3s2, 3p6 and since 4s is filled before 3d, we get 4s2 and 3d1
Correct answer: 1s2,2s2,2p6,3s2,3p6,4s2,3d1- A. 28
- B. 29
- C. 30
- D. 34
Explanation: No of electrons = no of protons = atomic number in a neutral atom. Since Ga-69 has atomic number 31 so its number of electrons is also 31…
Correct answer: 28- A. Releases
- B. Does not radiate
- C. Absorbs
- D. None of these
Explanation: It's because there are only a limited number of stable states an electron in an atom can be in.
Correct answer: Does not radiate- A. Principal Quantum Number
- B. Spin Quantum Number
- C. Magnetic Quantum Number
- D. Azimuthal Quantum Number
Explanation: A is incorrect as The principal quantum number, n, describes the energy of an electron and the most probable distance of the electron from…
Correct answer: Magnetic Quantum Number- A. Electron mass is 1/87th of proton
- B. Electron are universal particles of all matter
- C. Electrons are produced in discharge
- D. None of the above
Explanation: The constancy of the e/m ratio for electrons despite variations in the gas present in the discharge tube or in the material of the cathode…
Correct answer: Electron are universal particles of all matter- A. A: Low potential and low pressure
- B. B: Low potential and high pressure
- C. C: High potential and high pressure
- D. D: High potential and low pressure
Explanation: In a discharge tube, cathode rays are produced when electrons are emitted from the cathode and accelerated towards the anode.
Correct answer: D: High potential and low pressure- A. JJ Thomson
- B. E Rutherford
- C. R Milliken
- D. WC Roentgen
Explanation: The determination of the charge of the electron using the effect of an electric field on the rate of fall of oil droplets under gravity…
Correct answer: R Milliken- A. Quantized
- B. Integral multiple of 'e'
- C. Not less than 'e'
- D. All of the above
Explanation: Millikan's oil drop experiment demonstrated that the charge on an oil droplet is quantized, meaning it can only exist in discrete values…
Correct answer: All of the above- A. Any atomic nucleus
- B. A radioactive atomic nucleus
- C. A neutron or a proton
- D. A neutron proton or an electron
Explanation: A nucleon is either a proton or a neutron, which are the subatomic particles found in the nucleus of an atom.
Correct answer: A neutron or a proton- A. Ferromagnetic
- B. Diagmagnetic
- C. Electromagnetic
- D. Paramagnetic
Explanation: A ferromagnetic substance, like iron, retains magnetic properties after removing the field.
Correct answer: Paramagnetic- A. Mg
- B. He
- C. Fe
- D. Ne
Explanation: Isoelectronic species have the same number of electrons. In this case, Na+ has 10 electrons after losing one to become an ion.
Correct answer: Ne- A. Ar & Cl-
- B. Ca & Ar
- C. Mg and Na
- D. Ag & Sn
Explanation: Argon has 18 electrons. The chloride ion also has 18 electrons.
Correct answer: Ar & Cl-- A. 37
- B. 32
- C. 35
- D. 20
Explanation: Atom A has 18 electrons with net charge of -1 which means it gained one electron.
Correct answer: 37- A. Ar & Cl-1
- B. Ca & Ar
- C. Mg & Na
- D. Ag & Sn
Explanation: Ar = 1s22s22p63s23p6 Cl- = 1s22s22p63s23p6 (doing for 18 electron instead of 17 because it gained one electron/anion)
Correct answer: Ar & Cl-1