Lithium - Floats, moves slowly and fizzes, Sodium - Floats, moves quickly, melts and fizzes. Gas may ignite with an orange flame, Potassium - Floats, moves very quickly and burns with a lilac flame , Rubidium - A violent production of white/orange sparks almost instantly, Caesium - It explodes almost instantly and breaks the glass trough,

Comparing Reactivity With Water

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