Periods:
1. Trend of Radius/I.E./E.A./E.N.
2. Metal and Non-metal (Transferring / Sharing Electrons)
3. Oxide and Chloride (Structure and Physical Properties)
4. Reaction of Oxide and Chloride with water/acid/base
It is a great practice to connect the physical and chemical properties in a series.
物理和化学性质的周期性得到统一
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