group 2
* Group 2 elements are known as alkaline earth metals.
* They can form strong alkali and they occur widely on earth crust.
* They are metals.
* They have melting points and densities that are quite low for metals.
* They react with air, water or steam to form oxides and hydroxides.
* They show the same reactivity trend as group 1, increasingly reactive as you go down the group.
* They form compounds in which the metal has a +2 ion.
* They form white or colorless compounds which gives colorless solutions.
* The alkaline earth metals are reactive, but less reactive than the alkali metals.
HALOGENS
* Each of the halogens gives colored vapour.
* Halogens react with hydrogen to form hydrogen halides.
* Halogens react with metals to form metal halides such as iron chloride and sodium chloride, ordinary salt.
* Halogens are oxidizing agents and are themselves reduced.
* Any halogen can displace another that is lower down in group 7.
* We can use ionic equations to show how halogens react.
* Halogens compounds have useful properties.
* They have diatomic molecules X2 .
* They go from gases to liquid to solid as you go down the group.
* They become less reactive towards the bottom of the group.
* Group 2 elements are known as alkaline earth metals.
* They can form strong alkali and they occur widely on earth crust.
* They are metals.
* They have melting points and densities that are quite low for metals.
* They react with air, water or steam to form oxides and hydroxides.
* They show the same reactivity trend as group 1, increasingly reactive as you go down the group.
* They form compounds in which the metal has a +2 ion.
* They form white or colorless compounds which gives colorless solutions.
* The alkaline earth metals are reactive, but less reactive than the alkali metals.
HALOGENS
* Each of the halogens gives colored vapour.
* Halogens react with hydrogen to form hydrogen halides.
* Halogens react with metals to form metal halides such as iron chloride and sodium chloride, ordinary salt.
* Halogens are oxidizing agents and are themselves reduced.
* Any halogen can displace another that is lower down in group 7.
* We can use ionic equations to show how halogens react.
* Halogens compounds have useful properties.
* They have diatomic molecules X2 .
* They go from gases to liquid to solid as you go down the group.
* They become less reactive towards the bottom of the group.
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