An element A is soft and can be cut with a kn | vedclass

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(B) The properties described are characteristic of alkali metals. $1$. Alkali metals like $Na$ (Sodium) and $K$ (Potassium) are soft enough to be cut

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$Na$

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(B) The properties described are characteristic of alkali metals. $1$. Alkali metals like $Na$ (Sodium) and $K$ (Potassium) are soft enough to be cut with a knife. $2$. They are highly reactive with oxygen in the air,forming oxides,and thus are stored in kerosene to prevent contact with air and moisture. $3$. They react vigorously with water to produce hydrogen gas and metal hydroxides. Among the given options,$Na$ (Sodium) fits all these criteria.

An element $A$ is soft and can be cut with a knife. It is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following:

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