Group 2 Alkaline earth metals

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  • Created by: Naana
  • Created on: 06-05-15 13:26
What is the trend in atomic radii in group 2?
Increases down the group. As you go down group 2 the elements get an extra shell so the atoms get bigger
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What is the trend in melting point in group 2?
Decrease down the group. As you go down group 2 the delocalised electrons are further away from the positive nuclei. As a result, the strength of the metallic bond decreases and so do the melting points
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What is the trend in ionisation energies in group 2?
Decrease down the group. As you go down group 2, outer electrons are further away from positive nucleus. Also sheilding of inner shells increase so less energy is required to remove the electrons
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What happens when group 2 elements react?
They lose their two outer electrons to form 2+ ions. They are oxidised
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What is the trend in solubilities of the group 2 hydroxides?
Solubility increases down the group. They become more soluble.
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What is the trend in solubilities of the group 2 sulfates?
Solubility decreases down group 2. Barium sulfate is virtually insoluble so is used in barium meals as it is good at absorbing x rays
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What is the test for sulfate ions using barium sulfate?
Solution is acidified using HNO3 or HCl to remove carbonate ions. Then barium chloride solution is added to the solution under test. If sulfate is present a white precipitate of barium sulfate forms
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Other cards in this set

Card 2

Front

What is the trend in melting point in group 2?

Back

Decrease down the group. As you go down group 2 the delocalised electrons are further away from the positive nuclei. As a result, the strength of the metallic bond decreases and so do the melting points

Card 3

Front

What is the trend in ionisation energies in group 2?

Back

Preview of the front of card 3

Card 4

Front

What happens when group 2 elements react?

Back

Preview of the front of card 4

Card 5

Front

What is the trend in solubilities of the group 2 hydroxides?

Back

Preview of the front of card 5
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