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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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Discovery of the ProtonPlanck's Quantum TheoryQuantum NumbersShapes of OrbitalsSpectrum of HydrogenElectronic Configuration
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922 questions · page 47 of 47

921. Isotonic symbol of the ion of Sulphur-33 is shown below. How many protons and neutrons are present if the number of electrons are 18?

  • A. p= 18, n= 15
  • B. p=16, n=17
  • C. p=16, n=16
  • D. p=17, n=16

Explanation: Sulphur has atomic number 16, so its nucleus holds 16 protons whatever the ion's charge. Mass number 33 gives neutrons = 33 - 16 = 17.

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Correct answer: p=16, n=17

922. Carbon-14 is used in carbon dating. Which of the following species has both same number of neutrons and same number of electrons as in atom of c-14?

  • A. 14N
  • B. 14N+
  • C. 12C
  • D. 13C

Explanation: Carbon-14 has 6 protons, 8 neutrons and 6 electrons. Nitrogen-14 has 7 protons and 7 neutrons, and the singly charged ion N-14 positive…

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Correct answer: 14N+
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