1) its laid out in order of increasing proton number.
2)left side= metals right side= non-metals
3)elements with similar properties form collums
4)vertical columns are called groups.
5)the properties of one element can be used to predict properties of other (e.g group 1)
6)G1-elements react more as you go down, G7-reactivity decreases as you go down.
7) rows are called periods-new period represents another full shell of electrons.
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