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Identify the elements with the following property and arrange them in increasing order of their reactivity
(a) An element which is a soft and reactive metal.
(b) The metal which is an important constituent of limestone.
(c) The metal which exists in a liquid state at room temperature.
(a) An element which is a soft and reactive metal - Sodium (Na).
(b) The metal which is an important constituent of limestone - Calcium (Ca).
(c) The metal which exists in a liquid state at room temperature - Mercury (Hg).
and order of reactivity : Hg < Ca < Na
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