AQA AS Chemistry Unit 2: Group 2 The Alkaline Earth Metals
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- Created on: 01-05-13 23:45
Chemistry Unit 2: Group 2 The Alkaline Earth Metals
The Physical Properties Mg to Ba
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Group 2: called alkaline earth metals due to their oxides and hydroxides being alkaline
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They are S-Block element but are less reactive than Group 1
Electron Arrangement
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All have 2 electrons in the highest energy level
The Sizes of the Atoms
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Atoms get bigger down the group
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Atomic radii increases due to extra filled energy level
Melting Points
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High melting points due to giant metallic structure.
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Decreases down the group due to sea of delocalised electrons being further away from the nucleus so metallic bonds strength decreases down the group
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Magnesium has the lowest melting point due to different lattice arrangement of atoms
Ionisation Energies
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All reactions in group 2 they lose their 2 highest energy electrons to form positive ions
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M -> M2+ + 2e- : 1st and 2nd Ionisation energies together
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Both the 1st and 2nd ionisation energies decrease down the group
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Takes less…
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