The group 1 elements in the periodic table are known as the alkali metals. They include lithium, sodium and potassium, which all react vigorously with air and water.
The reactivity of the alkali metals increases down the group. Flame tests are used to identify alkali metal ions in compounds.
The group 1 elements are placed in the vertical column on the left hand side of the periodic table.
Lithium, sodium and potassium are the three group 1 elements you are likely to see at school. Like all the group 1 elements, they are very reactive. They must be stored under oil to keep air and water away from them. Group 1 elements form alkaline solutions when they react with water, which is why they are called alkali metals.
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