The equation for the beta decay of 14C: The equation for the alpha decay of Ra:
Exponential decay and semi-log plots Video transcript - [Voiceover] Let's look at three types of radioactive decay, and we'll start with alpha decay.
In alpha decay, an alpha particle is ejected from an unstable nucleus, so here's our unstable nucleus, uranium An alpha particle has the same composition as a helium nucleus. We saw the helium nucleus in the previous video. There are two protons in the helium nucleus and two neutrons. So I go ahead and draw in my two neutrons here.
Since there are two protons, the charge of an alpha particle is two plus. So for representing an alpha particle in our nuclear equation, since an alpha particle has the same composition as 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.
Trying to figure out the other product from our nuclear equation, I know nucleons are conserved, so if I have nucleons on the left, I need nucleons on the right.
Well, I have four from my alpha particle, so I need more. So plus four gives me a total of on the right, and so therefore nucleons are conserved here.
In terms of charge, I know charge is also conserved.
On the left, I know I have 92 protons, so 92 positive charges on the left. I need 92 positive charges on the right. We already have two positive charges from our alpha particle, and so we need 90 more.
So we need 90 positive charges. We need an atomic number here of 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. So thorium is our other product. So we think about what's happening visually, we're starting off with a uranium nucleus which is unstable, it's going to eject an alpha particle, so an alpha particle is ejected from this nucleus, so we're losing this alpha particle, and what's left behind is this thorium nucleus.
So this is just a visual representation of what's going on here, in our nuclear equation. Let's do beta decay. So in beta decay, an electron is 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 here's our electron and an electron ejected from the nucleus is called a beta particle. We could put a beta here, and it's an electron, so a negative one charge, and then a zero here.
If a beta particle is ejected from the nucleus of a thorium, so we're starting with thorium, this nucleus ejects a beta particle, so we go ahead and put a beta particle in here, so zero and negative one, what else is produced here?
What else do we make? Well, once again, the number of nucleons is conserved, so I have nucleons on the left, I need on the right.Dec 21, · the lonest-lived radioactive isotope yet discovered is the beta-emitter tellerium it has been determined that it would take x10^21 years for % of this isotope to decay.
write the equation for this reaction, and identify the isotope into which tellerium decays. it takes about 10^16 years for just half the samarium in Status: Resolved.
Carbon and carbon are both stable, while carbon is unstable and has a half-life of 5,±40 years. Carbon decays into nitrogen through beta decay. A gram of carbon containing 1 atom of carbon per 10 12 atoms will emit ~ beta particles per second.
The primary natural source of carbon on Earth is cosmic ray action on nitrogen in the atmosphere, and it is therefore a . A radioactive atom can decay by emitting a beta particle which is a fast moving electron. A natural example of beta emission is the decay of carbon .
Write a balanced nuclear equation for the alpha decay of americium /95 Am /2He+ /93Np Write a balanced nuclear equation for the beta decay of bromine Watch video · If they say that it's half-life is 5, years, that means that if on day one we start off with 10 grams of pure carbon, after 5, years, half of this will have turned into nitrogen, by beta decay.
Nuclear equations represent the reactants and products in radioactive decay, nuclear fission, or nuclear fusion. Instead of chemical equations where it shows the different number of elements is conserved in a reaction, in a nuclear reaction the atomic mass and proton number are conserved.