Chemistry (AS Level)·The Periodic Table & periodicity · NSSCAS 3.1.3–3.1.4
Chemical Periodicity of Period 3
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Across Period 3 the chemistry changes just as regularly as the physics. Learn the reactions of the elements with oxygen, chlorine and water, how the oxides swing from basic through amphoteric to acidic, how the chlorides react with water, and how to read all of it from bonding and electronegativity — then use periodicity to predict an unknown element.
What you'll learn in this lesson
By the end you should be able to (NSSCAS Chemistry (AS Level) 3.1.3–3.1.4):
- Describe the reactions of Period 3 elements with oxygen, chlorine and water
- State and explain the variation in oxidation number of the oxides and chlorides
- Describe the reactions of the oxides with water and their acid/base (and amphoteric) behaviour
- Describe and explain the reactions of the chlorides with water
- Interpret the trends in terms of bonding and electronegativity, and predict properties of unknown elements
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