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

CBSE Class 10 CBSE Class 10 Science
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1

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.
© The metal which exists in liquid state at room temperature.

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(a) Na or K (b) Ca © Hg Hg < Ca < Na < K