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.
- ‘You need an alkali metal, which has one electron in the outer shell, to make the process work.’
- ‘Sodium is an alkali metal and tends to lose an electron to form the positive sodium ion (Na +).’
- ‘We've used such smart polymers to fabricate chemically sensitive holograms responsive to water, alcohol, pH, and positively charged ions of alkali metal.’
- ‘He isolated potassium, another well known alkali metal, from potassium hydroxide in the same year.’
- ‘The first family on the periodic table is the alkali metals.’