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The Periodic Table: Mendeleev found he could arrange the 65 elements then known in a grid or table so that each element had:1. A higher atomic weight than the one on its left. For example, magnesium (atomic weight 24.3) is placed to the right of sodium (atomic weight 23.0):23.0
2. Similar chemical properties to other elements in the same column - in other words similar chemical reactions
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