First slide

Radio activity

Question

A radioactive nucleus undergoes a series of decay according to the scheme
$A \overset{α}{⟶} A_{1} \overset{β^{-}}{⟶} A_{2} \overset{α}{⟶} A_{3} \overset{γ}{⟶} A_{4}$
If the mass number and atomic number of A are 180 and 72 respectively, what are these numbers for A₄?

Easy

A

172,69
B

69,172
C

180,69
D

69,180

Solution

Mass number of $A_{4} = 172$ Atomic number of $A_{4} = 69$
for A₁ z=70 ,A=176 FOR A₂ Z=71, A=176 FOR A₃ Z=69 , A=172 A₄ is also same

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