## a. _{83}^{212} B i \rightarrow_{81}^{208} T l+_{2}^{4} H eb. \underset{36}{96} K r \rightarrow_{37}^{95} R b+_{-1}^{0} e+Dc. _{60}^{144} N d \rightarrow_{2}^{4} H e+_{58}^{140} C e

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the number 27 for each one of these. I just need to complete the equation. So here I start with this business. Um, it has amassed number 28 to 12. And here again, tell her I lose. I lose an alpha particle. This is Alfa Decay here, so I'm losing, you know? Well, breaking off four. It's a man. So this will be to await on top on the bottom. I'm losing two protons. So this is 81. So I just look up on the periodic table and see what has an atomic number of 81. And that is Valium. C O report. Be Oh, this is beta decay. So when you're beta decay, one of the new trans splits into a proton and electron So here's the electron. So I didn't I didn't really change mass Number of all mass number Still 95 because just that neutron turned into a poem. But I do have one more proton supposed to be 37. So I look in the periodic table, see what has a temperament with 37 that's rubidium. Or be for the last one. Here it is Alfa decay again. So my total number of new clan 1 40 in that for on that. So it must have started with 1 44 and home in 48 2 more. It must have started with 50 pro tones. So looking to hear a table and see that's the and do no, you didn't.

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