BRAINCAKE

Periodicity

OCR AS-level ChemistryTopic 6 of 1214 lessons

Revision notes for Periodicity in OCR Chemistry A (H032). Every lesson in BrainCake comes with R.E.C.I.P.E. recall steps, a quick check and spaced reviews.

  1. The Periodic TableMendeleev arranged the (approx) 60 known elements in order of "atomic weight" in groups with similar properties and left gaps for undiscovered…
  2. Electron ConfigurationThe chemistry of each element is determined by its electron configuration, in particular, the number of electrons in the outermost (highest energy)…
  3. Ionisation EnergyThe first ionisation energy is the energy required to remove one electron from each atom in one mole of gaseous atoms of an element to form one mole…
  4. Successive Ionisation EnergiesSuccessive ionisation energies increase because the remaining electrons are pulled closer to the nucleus after each electron is lost and the nuclear…
  5. Trends in First Ionisation Energies Across a PeriodThere is a general increase in ionisation energy across a period.
  6. Trends in First Ionisation Energies Down a GroupThe first ionisation energy decreases down a group.
  7. Beryllium and BoronAlthough there is a general trend in first ionisation energies across a period, and the ionisation energy increases across the period, except from…
  8. Nitrogen and OxygenAlthough there is a general trend and the first ionisation energy increases across a period, the first ionisation energy falls from nitrogen to…
  9. Metallic BondingAll metals are solid at room temperature with the exception of mercury.
  10. Properties of MetalsMost metals have strong metallic bonds, high electrical conductivity in the solid and liquid states and high melting and boiling points.
  11. Giant Covalent StructuresMost non-metals exist as simple covalent molecules.
  12. DiamondDiamond is a giant structure of carbon atoms covalently bonded to four other carbon atoms.
  13. Graphite and GrapheneGraphite is a giant covalent structure.
  14. Periodic Trends in Melting PointsAcross periods 2 and 3, the melting point increases from groups 1 to 14 (4) then there is a sharp decrease in melting point between group 4 and 5.

On the specification

All OCR AS-level Chemistry topics