Question
Yttrium- $90,$ which emits beta particles, is used in radiotherapy. What is the decay product of yttrium-90?
Step 1
From the periodic table, we know that Yttrium (Y) has an atomic number of 39 and a mass number of 90. So, we can represent Yttrium-90 as $_{39}^{90}\text{Y}$. Show more…
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