Periodic table aqa chemistry gcse

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  • Created on: 23-05-12 18:24
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How was the periodic table developed and how can it help us understand the reactions of
Atomic mass
8th element had similar properties (law of octaves)
No gaps, work ignored
Atomic mass
Physical and chemical properties
He left gaps
20th century
Arranged in order of atomic (proton number)
Arranged in terms of electronic structures
Higher the energy level
- more easily electrons are lost
-less easily electrons are gained
Group 1 metals ­ Alkali metals
Low density
React with non metals to form ionic compounds (metal ion carries +1 charge) (white
solids which dissolve in water to form colourless solution and release hydrogen)
form hydroxides ­ dissolve in water to give alkaline solutions
Further down the group
- more reactive element
- lower melting and boiling point
Group 7 ­ halogens
Coloured vapours
Consist of molecules made up of pairs of atoms
Form ionic salts (chloride, bromide, iodide ion carries -1 charge)
Form molecular compounds with other non-metallic elements
More reactive halogen displace less reactive halogen from aqueous solution of its salt
Further down the group
- less reactive element
- higher melting and boiling point
Between groups 2 and 3 ­ transition metals
Similar, special properties
Ions with different charges
Form coloured compounds
Useful as catalysts
Compared to group 1
- higher melting boiling points (except mercury) and higher
. densities
- stronger and harder
- much less reactive and so do not react as vigorously with water
. and oxygen


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