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 trend in atomic radius across a period?

  • It increases up to the covalent macromolecules, then decreases
  • It decreases (more protons)
  • It increases (more electrons)
  • It increases (larger nucleus)
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2. 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

3. What is the Pauli Exclusion Principle?

  • Electrons fill up shells from the lowest energy level first
  • Electron repulsion is minimised in lone pairs
  • Electrons occupy orbitals singly before pairing up
  • Two identical fermions occupy the same quantum state simultaneously.

4. 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

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

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


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