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Periodic table

Until recently there were two ways of categorising elements:
1) There physical and chemical properties
2) Their relative atomic mass

· 1864, John Newlands tried to arrange the elements using the law of octaves.
· His work was ignored as there was inconsistency as he progressed.
· In…

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Iodine: Dark grey Crystalline solid or purple vapour.
· They all go around in pairs , e.g. : F2.
· They form 1 ions when they bond with metals.
· They react to form slats.
· Most reactive halogens will displace less reactive ones.


­ Reactivity decreases as you go…

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