The Periodic Table
- Created by: anniedarlington
- Created on: 22-03-15 21:16
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- the periodic table
- the history
- newlands law of octaves
- every eighth element had similar properties
- pattern broke down after the third row
- mendeleev
- left gaps unlike newlands
- predicted properties of future elements
- left gaps unlike newlands
- relative atomic mass
- whatboth newlands and mendeleev ordered elements by
- newlands law of octaves
- modern periodic table
- now based on electronic structure
- scientists now accept its importance
- group 1
- alkali metals
- reactivity increases
- outer electron becomes further away from nucleus - more shielded - less attraction - easier to lose
- form 1+ ions
- melting point decreases
- reaction with water produces hydrogen - produce white compounds which dissolve to form colourless solutions
- reactivity increases
- alkali metals
- group 7
- the halogens
- reactivity decreases
- outer electron becomes further away from nucleus - more shielded - less attraction - harder to gain
- melting point increases
- 1- charge
- coloured vapours - exist as paired molecules - more reactive halogens will displace less reactive ones
- reactivity decreases
- the halogens
- transition elements
- good conductors
- often have more than one ion eg Fe2+ and Fe3+
- compounds are v colourful
- t.e and their compounds are good catalysts
- the history
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