some are easily, all of them react with air which they tarnish quickly. lithium, potassium, rubidium , caesium and francium all ignite when they are placed in water. but overall there is nothing else i can really say from what i know. :-)
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They are extremely reactive with acid -explosively in some cases. They are also very reactive with water and form alkaline solutions and also very reactive with halogens. Apart from that they have the usual properties of metals such as ductility and lustre etc.
2 valence electrons (apex)
No. The alkali and alkaline earth metals are very reactive.
The alkaline earth metals are in the group 2 of the periodic table of Mendeleev.
All alkaline earth metals and their salts are reactive and they have a blue-print that identifies them as an alkaline earth metal but metals exist as metals, and salts as salts, with different structural compounds.
Beryllium, magnesium and barium are three more alkaline earth metals.