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 is the relative mass of an electron?

  • 1/1840
  • 0.005
  • 1/30,000
  • 0.000001
1 of 16

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

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

3. What group is this element in, if these are successive ionisation energies: 578 1817 2744 11577 14842

  • Group 1
  • Group 3
  • Group 2
  • Group 4

4. Why are Nitrogen and Oxygen anomalies in first ionisation energy?

  • Oxygen should be higher than Nitrogen, however it is lower as it has more repulsion due to the paired outer electrons in the 2Px orbital
  • Oxygen should be higher than Nitrogen, however it is lower due to the fact the outer electron is being taken from a p orbital rather than an s (further from the nucleus)
  • Oxygen should be lower than Nitrogen, however it's nuclear charge overrides the added electron replusion
  • Oxygen should be lower than Nitrogen however as it is a better reducing agent it cannot loose electrons as easily

5. What is the trend in melting point across period 3?

  • It decreases across the group
  • It increases 1-3; then sharply peaks for G4 before dropping again
  • It increases across the group
  • It increases 1-4, then drops for G5 before before increasing again between G6 and G7


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