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Group I consists of the five metals: lithium, sodium, potassium, rubidium, and caesium, along with the radioactive element francium.
Lithium, sodium, and potassium are stored under oil to prevent contact with water or air.
Lithium is the softest among the three: lithium, sodium, and potassium.
Lithium, sodium, and potassium have low melting points compare to the other metals.
When freshly cut with a knife, lithium, sodium, and potassium have shiny surfaces.
Group I metals react with oxygen to form white solid oxides.
Group I oxides react with water to form alkaline solutions of the metal hydroxide.
Group I metals react with water to produce an alkaline solution of the metal hydroxide and hydrogen gas.
The further down Group I you go, the less reactive the metals become.
When Group I elements react, they lose their outer electron and become more stable by obtaining the electronic configuration of a noble gas.