Question
Complete the reaction: $_{86}​Rn^{220}\rightarrow _{84}​Po^{216}+ .......$ :

Answer

$_{86}​Rn^{220 }\rightarrow _{84}​Po^{216 }+ _Z​X^A$
$Z + 84 = 86$ and $220 = 216 + A$
So $, Z = 2$ and $A = 4$
$2​​\alpha^4$
So, it is $\alpha$ particle.

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