Question

Identify the elements with the following property and arrange them in increasing order of their reactivity

1. An element which is a soft and reactive metal
2. The metal which is an important constituent of limestone
3. The metal which exists in liquid state at room temperature

Answer 1

1. An element which is a soft and reactive metal is sodium.
2. The metal which is an important constituent of limestone is calcium.
3. The metal which exists in the liquid state at room temperature is mercury.
   The arrangement of these elements in increasing order of their reactivity would be mercury (Hg) < calcium (Ca) < sodium (Na).