Medical University Entrance Examination (Bulgaria) · General and Inorganic Chemistry

Atomic Structure and Periodic Properties

30 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 30 questions

  1. Which set of quantum numbers describes an electron in a 3d subshell orbital?
  2. What is the ground-state electron configuration of the transition metal chromium (Z = 24)?
  3. What is the ground-state electron configuration of the neutral copper atom (Z = 29)?
  4. Which rule states that electrons fill degenerate orbitals singly with parallel spins before pairing up?
  5. Why does oxygen have a slightly lower first ionization energy than nitrogen (1314 vs 1402 kJ/mol)?
  6. Why does boron have a lower first ionization energy than beryllium (801 vs 899 kJ/mol)?
  7. Which series lists the isoelectronic ions in order of decreasing ionic radius: N3-, O2-, F-, Na+, Mg2+, Al3+?
  8. Which element on the Pauling scale possesses the highest electronegativity value?
  9. Which transition metal ion forms a pale blue aqueous solution with six water ligands and turns deep royal blue upon addition of excess aqueous ammonia?
  10. What is the coordination number and oxidation state of cobalt in the complex [Co(NH3)5Cl]Cl2?
  11. Which decay particle is emitted when carbon-14 decays into nitrogen-14?
  12. What is the maximum number of electrons that can occupy a principal energy level with n = 4?
  13. How many unpaired electrons are present in the ground state of an isolated gaseous iron(III) ion (Fe3+, Z = 26)?
  14. Which element has the highest first electron affinity among the halogens?
  15. What type of radioactive emission consists of high-energy electromagnetic radiation with zero rest mass and zero charge?
  16. Which alkaline earth metal sulfate has the lowest solubility in water at 25 degrees Celsius?
  17. What gas is produced when elemental calcium reacts with liquid water at room temperature?
  18. Which property explains why noble gases exist as monoatomic gases with extremely low boiling points?
  19. Which halogen is a dense, reddish-brown volatile liquid at standard temperature and pressure?
  20. What is the oxidation number of manganese in the deep purple permanganate ion (MnO4-)?
  21. Which law states that the physical and chemical properties of elements are periodic functions of their atomic numbers?
  22. What is the total number of orbitals present within the third principal energy level (n = 3)?
  23. Which ion is diamagnetic in its ground electronic state?
  24. How does atomic radius generally vary across a period from left to right in the periodic table?
  25. Which amphoteric oxide dissolves readily in both aqueous hydrochloric acid and aqueous sodium hydroxide?
  26. What is the oxidation number of chromium in the bright orange potassium dichromate (K2Cr2O7)?
  27. Which quantum mechanical principle asserts that no two electrons in an atom can have the exact same four quantum numbers?
  28. Why is the second ionization energy of sodium (4562 kJ/mol) dramatically higher than its first (496 kJ/mol)?
  29. Which ligand in coordination chemistry is bidentate and coordinates through two donor atoms?
  30. Which aqueous salt solution produces a white precipitate insoluble in dilute nitric acid upon addition of barium chloride?

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