Free Electronic Configuration MCQs with Answers
103 Electronic Configuration MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Electronic configuration describes how electrons occupy shells, subshells and orbitals around an atom. Questions use the Aufbau principle, Pauli exclusion principle and Hund's rule to write configurations, identify valence electrons, form ions and explain periodic trends, including common exceptions such as chromium and copper.
Last updated
103 questions · page 6 of 6
101. Which one of the following ions has more electrons than protons and more protons than neutrons?
- A. D
- B. d-
- C. H-
- D. He
Explanation: H is Hydrogen, it's proton number is 1 so it has 1 proton, 1 electron and no neutrons.
Correct answer: H-- A. O2
- B. O+2
- C. O-2
- D. O2-2
Explanation: O2 has 2 unpaired electrons, O+2 has no unpaired electrons, O-2 has paired electrons while O2-2 also has no unpaired electrons hence the…
Correct answer: O2103. Bond order for O2+2
- A. Two
- B. One
- C. Zero
- D. None of the above
Explanation: The bond order for O2+2 is two, indicating a double bond.O2+2 is a diatomic molecule with two oxygen atoms.
Correct answer: Two