Do not hold metallic sodium with bare hands?

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Sodium( Na) is highly reactive metal. Even its contact with minor amount of water can cause explosive reaction.

Our hands and environment always has moisture whenever this moisture comes in contact with metallic sodium cause severe exothermic reaction and forms an alkali(base) and hydrogen.

Sodium-water-chemical-equation

Hydrogen is fire catching gas and strong bases cause severe burns more severe than acid burn because for realizing base burn we have skin damage before but acid burn stings immediately .

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