Question:
Which of the following elements is the radioactive alkaline earth metal?
Which of the following elements is the radioactive alkaline earth metal?
Show Hint
Alkaline earth metals are the group 2 elements, and only the last member has no stable isotope.
Updated On: Nov 12, 2026
- \(\text{Cs}\)
- \(\text{Rb}\)
- \(\text{Fr}\)
- \(\text{Ra}\)
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept
Alkaline earth metals are the group 2 elements: Be, Mg, Ca, Sr, Ba and Ra.
Step 2: Remove group 1 elements
Cs, Rb and Fr are alkali metals of group 1. Fr is the radioactive alkali metal, but it is not an alkaline earth metal.
Step 3: Radioactive member
Radium (Ra), the last element of group 2, has no stable isotope and is radioactive.
Final Answer:
The radioactive alkaline earth metal is radium (Ra). \[ \boxed{\text{(D) }\text{Ra}} \]
Alkaline earth metals are the group 2 elements: Be, Mg, Ca, Sr, Ba and Ra.
Step 2: Remove group 1 elements
Cs, Rb and Fr are alkali metals of group 1. Fr is the radioactive alkali metal, but it is not an alkaline earth metal.
Step 3: Radioactive member
Radium (Ra), the last element of group 2, has no stable isotope and is radioactive.
Final Answer:
The radioactive alkaline earth metal is radium (Ra). \[ \boxed{\text{(D) }\text{Ra}} \]
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