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The radioactive s-block elements are...

The radioactive s-block elements are

A

Ra and Ba

B

Ra and Fr

C

Fr and Cs

D

Rb and Sr

Text Solution

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The correct Answer is:
B
Not much is known about Fr because it is radioactive and all its isotopes are exceedingly short lived. Any that existed when the earth was formed will have disappeared and any formed now from actinium will have a transitory existence.
Radium is extremely scarce and is radioactive. It was first isolated by Pierre and Marie Curie by processing many tonnes of the uranium ore, pitchblende. It was used for the radiotherapy treatment of cancer at one time. Now, other forms of radiation `(.^(60)CO, X` rays, or a linear accelerator) are used for this purpose.
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