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  4. The number of α-particles emitted during the radioactive decay chain from (88/226) Ra andending at (82/206) Pb is

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Q. The number of $\alpha$-particles emitted during the radioactive decay chain from $\frac{88}{226} Ra$ andending at $\frac{82}{206} Pb$ is

KEAMKEAM 2020

Solution:

$\Delta A=226-206=N \times 4$
($N$-No. of $\alpha$-particles).
or $N=5$