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The Periodic Table (Dalton (1766-1844) (Everything is atoms, Element atoms…
The Periodic Table
Dalton (1766-1844)
Everything is atoms
Element atoms are all identical
atom particles cannot be destroyed or created
In compound atoms join together
In chemical reaction, atoms rearranged
Mendeleev
arranged elements by weight and made groups with similar properties
transition metals in the middle
group 1-alkaline metals
group 7-the halogens
group 8/6-the noble gases
because they have the same number of electrons on the outside of atom
Chemical and Physical
Physical
Properties
Melting point
boiling point
Density
strength
colour
changes
Don't change to chemical can usually reverse
Chemical
Properties
flammability
reactivity
changes
when atoms rearrange to make new chemicals e.g. combustion
Chemical trends
group1-alkaline metals reacts with water. They
Physical trends
melting points and density change as we go down the groups