Topic 1: Atomic Structure and the Periodic Table

All questions from the new (2015) specification. I hope they're useful!

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1. What shape is an s-orbital?

  • Spherical
  • Dumb-bell
  • 5-lobed
  • S-shaped
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2. What block is Ga in?

  • p-block
  • f-block
  • s-block
  • d-block

3. What is the electron structure of Cr? (24 electrons)?

  • 1s2 2s2 2p6 3s2 3p6 3d6
  • 1s2 2s2 2p6 3s2 3p6 3d5 4s1
  • 1s2 2s2 2p6 3s2 3p6 3d4 4s2
  • 1s2 2s2 2p6 3s2 3p6 4s2 4p4

4. O-16 and O-18 atoms are isotopes. Which is correct?

  • They have different atomic numbers
  • They have different numbers of neutrons
  • They have different electron configurations
  • They have the structure 1s2 2s2 2p6 3s2 3p4

5. What is the trend in ionisation energy down a group?

  • It decreases (more quantum shells)
  • It increases (more protons)
  • It varies (proton and repulsion effect depends on the element)
  • It increases up to the fourth element then decreases


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