Chemistry·Matter · Periodic Table · NSSCO 2.3.3
Group properties — Group I, Group VII, transition metals & noble gases
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The Periodic Table sorts elements into families that behave alike. Meet the soft, super-reactive alkali metals of Group I, the colourful halogens of Group VII, the dense catalytic transition metals in the middle, and the do-nothing noble gases of Group VIII — and learn the trends that let you predict how each behaves.
What you'll learn in this lesson
By the end you should be able to (NSSCO Chemistry 2.3.3):
- Interpret the Periodic Table as a way of classifying elements by their properties (metallic/non-metallic, groups and periods)
- Deduce and describe trends in physical and chemical properties within a group (melting point, density, colour, state, reactivity)
- Describe Li, Na and K in Group I as soft metals showing trends in melting point, density, reaction with water, and flame-test identification
- State that Group I metals form soluble hydroxides that cannot be precipitated
- Describe Cl, Br and I in Group VII as diatomic non-metals with trends in colour, reactivity and state
- State the reactions of Group VII elements with other halide ions (displacement)
- Describe the transition elements as dense, high-melting metals forming coloured compounds and acting as catalysts
- Describe the noble gases (Group VIII) as unreactive and state their use in providing an inert atmosphere
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