Group 2- the alkaline earth metals
- Created by: siobhan
- Created on: 29-03-14 15:02
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- Group 2 Chemistry
- All the elements in group 2 have 2 electrons in their outer shell.
- When they react they lose their two outer electrons to form 2+ ions
- The atomic radius increases as you go down the group as their is an extra electron shell.
- Ionisation energy decreases down the group
- down the group each element has an extra electron shell- more shielding
- easier to remove electron
- extra electron shell means the outer electrons are further away from the nucleus
- easier to remove electron
- extra electron shell means the outer electrons are further away from the nucleus
- down the group each element has an extra electron shell- more shielding
- Reactivity increases down the group
- when they react they lose electrons. Ionisation energy decreases down the group making them more reactive
- Melting points generally decrease down the group
- group 2 elements have metallic structures- the outer shell electrons are delocalised
- these mean there is reduced attraction between the positive ions and the delocalised electrons. so it takes less energy to break bonds
- the exception is magnesium because the crystal structure (the arrangement of metallic ions) changes.
- these mean there is reduced attraction between the positive ions and the delocalised electrons. so it takes less energy to break bonds
- going down the group metallic ions get bigger so they have a smaller charge/ volume ratio, but the number of delocalised electrons stays the same so the delocalised electrons are more spreads out
- these mean there is reduced attraction between the positive ions and the delocalised electrons. so it takes less energy to break bonds
- the exception is magnesium because the crystal structure (the arrangement of metallic ions) changes.
- these mean there is reduced attraction between the positive ions and the delocalised electrons. so it takes less energy to break bonds
- group 2 elements have metallic structures- the outer shell electrons are delocalised
- All the elements in group 2 have 2 electrons in their outer shell.
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