Elements in Group 1 (1)

Chemistry

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Symbol of potassium

Sodium

Reactant: Alkali metal + Water

Product: Metal hydroxide + Hydrogen gas

Reactant: Alkali metal + Oxygen gas

Product: Metal oxide

Product: Metal chloride

Reactants: Alkali metal + Chlorine gas

Uses of lithium

Production of battery

Uses of potassium

Used in fertiliser

Density of alkali metals

Low density and float on the surface of water

Changes in the reactivity of the elements in Group 1 when going down the group

The reactivity increases

An unstable radioactive isotope with a short half-life

Francium

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