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Alkali Metals
The Alkali Metals form Group 1 of The Periodic Table

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.

Flame colour Ion…

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The reactions of Alkali Metals with water:

Sodium + Water Sodium Hydroxide + Hydrogen Gas

2Na + 2HO 2NaOH + H

Lithium + Water Lithium Hydroxide + Hydrogen Gas

2Li + 2H0 H + 2LiOH

Potassium + Water Potassium Hydroxide + Hydrogen Gas

2K + 2H0 H + 2KOH


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The bigger the atom, the easier it is for the outer electron to be lost.
That is why the lower elements are more reactive. Rubidium and
caesium are even more reactive than potassium.


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