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 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
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2. What is the relative atomic mass?

  • The sum of the protons and neutrons in the nucleus
  • The weighted mean mass of an atom of an element compared to 1/12 the mass of a c-12 atom
  • The mass of an atom of an element compared to C-12
  • The mass of an isotope compared to 1/12 the mass of the C-12 isotope

3. These are the successive ionsations of Mg. What could A be? 738 ; 1451 ; A ; 10543 ; 13630

  • 1500
  • 10550
  • 7730
  • 2150

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

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

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

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

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