An element X is soft and can be cut with the help of a knife It is very reactive to air and cannot b...........

Chemistry Chapter- 3

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

छोटे Courses बड़े Results

Master Chapter- 3

Prepare through Micro-courses

Try Now

Explanation:

Na is a metal which is soft enough to be cut with a knife. It is so reactive that it reacts vigorously with air or moisture and catches fire when kept in open. So to prevent it from coming in contact with oxygen and moisture, it is kept in kerosene.2. The number of protons in an atom of an element A is 19 then, the number of electron in its ion A+ is: