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MHT CET Medical202625 April 2026Evening ShiftChemistrys Block ElementsActual

Which of the following elements is the radioactive alkaline earth metal?

Options

  1. ACs
  2. BRb
  3. CFr
  4. DRa

Correct answer

D. Ra

Step-by-step solution

The alkaline earth metals belong to Group 2 of the periodic table, which includes Beryllium ( Be ), Magnesium ( Mg ), Calcium ( Ca ), Strontium ( Sr ), Barium ( Ba ), and Radium ( Ra ). Among these elements, Radium ( Ra ) is the only naturally occurring radioactive alkaline earth metal. Cesium ( Cs ), Rubidium ( Rb ), and Francium ( Fr ) are alkali metals (Group 1), with Francium being the radioactive alkali metal. Answer: Ra

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