- Form colored compounds.
- Exhibit variable oxidation state (e.g. iron has an oxidation state of +2 and +3).
- Make good catalyst
- High melting point, boiling point, and density
2. Noble gas (Group VIII or 0)
- non- reactive
- (generally) do not form compounds, as they have stable electronic configuration
3. Group I
- reactivity increases down the group.
- react vigorously with cold water to give hydroxides and hydrogen.
- have a lower density, and melting point than other metals.
- form carbonates that are stable to heat.
4. Group VII
- reactivity decreases down the group.
- color intensity increases down the group.
- melting point, boiling point and density increases down the group.
|Colours of Group VII elements|
-exist as diatomic molecules e.g. Cl2, Br2, I2, At2, F2
-undergo displacement reaction, where a more reactive halogen will displace a less reactive halogen.
- Quizzes and Tests on Periodicity