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Q.

Which element disintegrates to give two noble gases

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a

Ra

b

Th

c

Rn

d

He

answer is A.

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Detailed Solution

' $Ra$ ' disintegrates to give two noble gases.

Radium undergoes radioactive decay, looses 2 electron and 4 proton to give Rn and He.

$ {}_{88}^{226}{R a} \to {}_{2}^{4}{H e} + {}_{86}^{222}{R n}$

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Which element disintegrates to give two noble gases