Any of the elements lithium, sodium, potassium, rubidium, cesium, and francium, occupying Group IA (1) of the periodic table. They are very reactive, electropositive, monovalent metals forming strongly alkaline hydroxides.
- He isolated potassium, another well known alkali metal, from potassium hydroxide in the same year.
- Sodium is an alkali metal and tends to lose an electron to form the positive sodium ion (Na +).
- You need an alkali metal, which has one electron in the outer shell, to make the process work.
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