Chemistry OCR 1.2.4 Electrons and the Periodic Table

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1. What is the electronic configuration of Potassium, K?

  • 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2
  • 1s^2 2s^2 2p^6 3s^2 3p^6 4s^4
  • (^ indicates a subscript) 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1
  • 1s^2 2s^2 3s^2 3p^6 4s^1
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2. According to the Aufbau principle when does the 4s sub-shell fill?

  • before the orbitals in the 3d sub-shell
  • after the orbitals in the 3d sub-shell
  • at the same time as the orbitals in the 3d sub-shell
  • it doesn't fill at all

3. The Periodic Table is structured in blocks of 2,6,10 and 14 elements, linked to....

  • atoms
  • sub-shells
  • shells
  • orbitals

4. When positive ions are formed, what happens to the electrons in the highest energy orbitals?

  • the number of the electrons is doubled
  • electrons are added
  • electrons are removed
  • the number of electrons stays the same

5. Using the structured blocks, you can work out the electronic configurationof any element using the Periodic Table. Oxygen is the 4th element in the 2p-block. What would be its electonic configuration?

  • 1s^2 2s^2 2p^3
  • (^ indicates subscript) 1s^2 2s^2 2p^4
  • 1s^2 2s^2 2p^6
  • 1s^2 1s^2 2p^4


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