Gamma Emission - Online Tutor, Practice Problems & Exam Prep

Gamma rays are a form of electromagnetic radiation with the highest energy, shortest wavelength, and highest frequency. They are represented as $0/0$, indicating no change in atomic mass or number during gamma emission. This process involves energy absorption, causing electrons to transition to higher energy levels. Despite having the lowest ionizing power, gamma rays possess the highest penetrating power, making them extremely hazardous to biological tissues, as even minimal exposure can be lethal.

Gamma Emission Concept 1

Guys, in this new video, we're going to take a look at gamma emissions. So here we're going to say gamma radiation is related to the electromagnetic spectrum. Now, we're going to say here gamma rays have the highest energy and therefore they have the lowest or shortest wavelength, and then they have the highest frequency. So remember, you have to remember from electromagnetic spectrum theory, that when it comes to energy, energy and frequency are directly proportional. All that means is if one is high, the other one would be high. But when it comes to wavelength, wavelength is inversely proportional to both of them. All that means is that wavelength is the opposite of the other 2. If they're high, it's low. If it's high, they're low. So it's a complete opposite of frequency and energy, and remember, wavelength is just the distance from one wave to another wave. Where frequency is, how many waves do you get within one second. So if your distance between waves, the crest, the tops of them is very large, that means you don't get many waves in a second. But if the wavelength is very small, if the distance between them is very small, you can cram a bunch of them in within one second. Okay. So then you would say the frequency is extremely high, and the energy is high. Gamma rays have the highest behind cosmic rays. Cosmic rays would actually be a little bit higher than gamma rays. We usually don't hear about this in lecture, but in lecture, so strictly lecture, we're going to say gamma rays have the highest energy, and therefore they have the highest frequency, and therefore the lowest or shortest wavelength. If you went beyond just general chemistry, you go into physics and other, higher-level sciences, they'd start talking about cosmic rays, which are then even higher than gamma rays. But for right now, just focused on the simple electromagnetic spectrum, gamma rays are going to have the highest energy.

Gamma Emission Concept 2

Now we're going to say a gamma particle can be represented by 00 and the gamma symbol is this. Now, you're going to say because it's 00, you should realize that a gamma ray actually does not cause any change in your atomic mass or atomic number. And because of that, we usually see it happening with alpha decay or beta decay. But what's the whole purpose of gamma emission then? Well, we're going to say when it comes to gamma emission, it has to do with the absorption of energy. So here we're going to say this wavy live line represents energy, and this electron is in our first shell in our atom. So here in absorption, the electron is going to absorb that excess energy and become excited, and use that extra energy just absorbed to jump up to either a higher shell number or to a higher orbital number. So basically, if you go from 1s2 to 2s2. So you're going from the first shell to the second shell, that represents absorption. You could also go from the 3s3 to 3d3. You can script skip 3p3 altogether, and just jump up straight to 3d3. Both of these examples represent absorption. The first one represents absorption where you jump from a one shell to a higher shell, and then the 3s3 to the 3d3 represents you absorbing energy and jumping up from a lower orbital to a higher orbital within the same shell. Both of them begin with the number 3, so they're both within the third shell of your atom, but d orbitals have more energy than s orbitals. So if we solve this, we'd have 4020Ca. It undergoes a gamma emission, and we'd say that that calcium has an electron that had just absorbed, energy and it's going to become excited. So we put a little asterisk by it to show that it's in an excited state. So that will represent a gamma emission. Now, we're going to say that gamma particles, they have the lowest ionizing power, but they have the highest penetrating power. So if you're ever exposed to gamma emission, like gamma radiation, it's basically a done deal. You're not going to survive. Gamma radiation is extremely toxic to living tissue and biological systems. So any exposure to even the smallest amount of gamma radiation would completely eviscerate all the living cells and tissues within your body. So it has the lowest ionizing power, but it's still extremely dangerous.

Gamma Emission Example 1

Now, if we go to this example, it says which of the following represents an element that has experienced a gamma emission? Here we have electron configurations for elements. Remember, the normal pattern is, you go from 1s to 2s to 2p to 3s to 3p4s etcetera. And remember, gamma emission involves the excitation or the absorption of energy gets you into an excited state, so you could actually have an electron skipping an entire orbital, like it's supposed to be in the 2s, but it gains so much energy it skips 2s and goes to 2p. Or you could have an electron gaining even more energy and going from 2s to 3s. So, if we look, the one that fits this excited state or this gamma emission state would have to be sodium, because we're supposed to see 1s followed by 2s, followed by 2p, followed by 3s. But what must have happened? This electron in here must have absorbed energy and therefore able to jump to a higher energy state. So the next one would be 3p. So it skipped the 3s and went straight to 3p. So this represents an element that has gained sufficient energy to become excited, which represents a gamma emission. So remember, gamma emission may not change your atomic mass or atomic number like alpha decay or beta decay, but it still does affect the atom in some way.