A radioactive nucleus undergoes a series of decays according to the sequence
$A β \to A_{1} α \to A_{2} α \to A_{3}$
If the mass number and atomic number of $A_{3}$ are $172$ and $69$ respectively, then the mass number and atomic number of A is
$56, 23$
$180, 72$
$120, 52$
$84, 38$

Question

Toppr Admin · Accepted Answer

AZA-x2192-A1-x2192-A2-x2192-69A1723

A radioactive nucleus undergoes a series of decays according to the sequenceAβ→A1α→A2α→A3If the mass number and atomic number of A3 are 172 and 69respectively, then the mass number and atomic number of A is56,23180,72120,5284,38