Trends within the Periodic Table
- Created by: Uswa
- Created on: 24-03-13 14:39
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- Trends within the Periodic Table
- Group 1 (Alkali Metals)
- Metals with LOW density. First 3 are less dense than water
- Reacts with non-metals to form an ion bond
- Where the group 1 ion carries a +1 charge
- The compounds are white solids that dissolve in water to form COLOURLESS solutions
- Where the group 1 ion carries a +1 charge
- React with water to release HYDROGEN
- Form hydroxides that dissolve in water to give ALKALINE SOLUTIONS
- Further down you go:
- The more reactive they become
- The lower their melting and boiling points
- Group 7 (Halogens)
- React with metals to form an ionic compound
- In which the halide ion carries a charge of -1
- More reactive halogen can displace a less reactive halogen from an aqueous solution of its salt
- Further down you go:
- The elements become less reactive
- Have a higher melting and boiling point
- React with metals to form an ionic compound
- Compared with Group 1, Transition elements:
- Have higher melting point (except mercury)
- Have higher density
- Are stronger and harder
- Much less reactive. Don't react as vigorously with oxygen and water
- Trends can be explained because
- The higher the energy level of the outer electrons:
- More easily electrons are lost
- Less easily electrons are gained
- The higher the energy level of the outer electrons:
- Group 1 (Alkali Metals)
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