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. 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
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2. What is the relative mass of an electron?

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

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

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

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

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

5. How many electrons can fit on the 2nd quantum shell? Which orbitals does it contain?

  • 8 ; the s (1x2) and p (3x2) orbitals
  • 10; the s (1x2) and p (2x4) orbitals
  • 18; the s (1x2) p (3X2) and d (5x2) orbitals
  • 6; the p(3x2) orbitals


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