The Periodic Table
C3 Unit 1
- Created by: Tabba
- Created on: 20-06-13 11:37
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- The Periodic Table
- the modern periodic table
- the new discovered elements were added to the gaps that mendeleev had left
- you can deduce the number of protons neutrons and electrons
- you can deduce thenumber of elcectron shells
- you can deduce the number of outer shell electrons
- you can deduce the properties of some elements
- group 7 - the halogens
- When they react with metals they form ionic compounds containing halide ions
- The charge on a halide ion is 1-
- The trend in melting and boiling points is that they increase as you go down the group
- They become less reactive as you go down
- the early periodic table
- newland
- arrabged the elements by atomis mass
- noticed every 8th element had similar properties
- no room for new elements
- two elements in the same place
- metals + non-metals got mixed up
- newland
- group 1 - alkaline metals
- Have low density - so they float on water
- When they react with non-metals they form 1+ ions
- They are white crystalised solids that dissolve and become colourless in water
- When they react with water they form metal hydroxide and hydrogen - they fizz float and catch fire
- Hyrdroxide dissolves in water to form hydroxide ions
- transition metals
- Found between groups 2 and 3
- E.g Copper, Iron, Mercury and Gold
- High melting point compared to group 1 metals
- Stronger and harder compared to group 1 metals
- Can form ions with different charges
- Can form coloured compounds
- They are useful catalysts
- the modern periodic table
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