Sr-90 is Beta minus active, the daughter nucleus is Beta active; write down the nuclear equations?

Question

* I will give a "best answer" *

Answer 1

I think that I mis read this before, you are saying you have a beta decay followed by another beta decay...

90 / 38 Sr   -->  0 / -1 e-   &  90 / 39 Y

Y-90 is your first daughter

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90 / 39 Y    -->  0 / -1 e-   &  90 / 40 Zr

Zr-90 is your second daughter