AQA AS Chemistry Unit 2: Group 2 The Alkaline Earth Metals

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Chemistry Unit 2: Group 2 The Alkaline Earth Metals

The Physical Properties Mg to Ba

  • Group 2: called alkaline earth metals due to their oxides and hydroxides being alkaline

  • They are S-Block element but are less reactive than Group 1

Electron Arrangement

  • All have 2 electrons in the highest energy level

The Sizes of the Atoms

  • Atoms get bigger down the group

  • Atomic radii increases due to extra filled energy level

Melting Points

  • High melting points due to giant metallic structure.

  • Decreases down the group due to sea of delocalised electrons being further away from the nucleus so metallic bonds strength decreases down the group

  • Magnesium has the lowest melting point due to different lattice arrangement of atoms

Ionisation Energies

  • All reactions in group 2 they lose their 2 highest energy electrons to form positive ions

  • M -> M2+ + 2e- : 1st and 2nd Ionisation energies together

  • Both the 1st and 2nd ionisation energies decrease down the group

  • Takes less

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