Which among the following elements is very reactive and can be cut with a knife?

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Detailed Solution

Sodium is the metal which is very reactive and can be cut with a knife.
The force of attraction between the atoms of these metals are so weak that the electrons in it are not located on a single atom but on a multiple atom making them very soft and this is the reason why sodium is kept in kerosene because it readily reacts with air and gets burnt.

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