The periodic table
- Created by: georgia lines
- Created on: 03-02-13 14:06
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- The periodic table
- The early periodic table
- John Dalton
- Arranged in order of mases
- Mendeleev
- Ordered with the elements' atomic weights
- John Dalton
- The modern periodic table
- Arrange elements in order of their atomic (proton) number
- Reactivity
- Group 1- INCREASES
- Going DOWN the group
- Group 7- DECREASES
- Going DOWN the group
- Group 1- INCREASES
- Group 1- Alkali metals
- Properties
- Very reactive
- Stored in oil-prevents them reacting with oxygen in air
- Very low density
- Soft
- Melt and boil
- low temps
- Properties
- Transition elements (metals)
- properties
- physical
- good conductors of electricity and energy
- Hard and strong
- High densities
- High melting points
- Chemical
- less reactive than metals in group 1
- Corrode slowly
- physical
- properties
- group 7-halogens
- Untitled
- The early periodic table
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