A piece of heated potassium is placed in chlorine. The reaction is violent and instantaneous which causes it to burn.
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Potassium is a chemical element. It has the symbol K (Latin: kalium) and atomic number 19.
When potassium is heated is starts reacting with oxygen. Since air is mostly oxygen, the reaction happens pretty quickly and it starts burning.
A small amount of lithium is heated and it reacts very quickly with oxygen creating a burst.
Lithium reacts with chlorine, a violent reaction happens and lithium starts to burn instantly.
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