So here's our electron and an electron ejected from the nucleus We saw in the previous video that you represent an electron, since it has a negative one charge, you put a negative one down here, it's not a proton, nor is it a neutron, so we put a zero here. So this is just a visual representation of what's going on here, To eject an alpha particle, so an alpha particle isĮjected from this nucleus, so we're losing this alpha particle, and what's left behind Happening visually, we're starting off with a uranium nucleus which is unstable, it's going The identity of the other product, just look it up here at our table, find atomic number of 90, and you'll see that's thorium here. We already have two positive charges from our alpha particle, and so we need 90 more. On the left, I know I have 92 protons, so 92 positive charges on the left. In terms of charge, I knowĬharge is also conserved. Total of 238 on the right, and so therefore nucleonsĪre conserved here. Well, I have four from my alpha particle, so I need 234 more. Trying to figure out the other product from our nuclear equation, I know nucleons are conserved, so if I have 238 nucleons on the left, I need 238 nucleons on the right. So for representing anĪlpha particle in our nuclear equation, since an alpha particle has the same compositionĪs a helium nucleus, we put an He in here, and it has two positive charges, so we put a two down here, and then a total of four nucleons, so we put a four here. Since there are two protons, the charge of an alpha There are two protons in the helium nucleus and two neutrons. An alpha particle has the same composition as a helium nucleus. In alpha decay, an alpha particle is ejected from an unstable nucleus, so here's our unstable Let's look at three types of radioactive decay, and we'll start with alpha decay.
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