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How to Split an Atom Download ArticleDiscover what happens when you split an atom, plus how scientists split atoms in the lab Co-authored by Joseph Quinones
Last Updated: July 13, 2025 Fact Checked
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Bombarding Radioactive Isotopes
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Compressing Radioactive Materials
|
Splitting Atoms with a Laser
|
Video
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Q&A
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Warnings
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This article was co-authored by Joseph Quinones. Joseph Quinones is a Physics Teacher working at South Bronx Community Charter High School. Joseph specializes in astronomy and astrophysics and is interested in science education and science outreach, currently practicing ways to make physics accessible to more students with the goal of bringing more students of color into the STEM fields. He has experience working on Astrophysics research projects at the Museum of Natural History (AMNH). Joseph recieved his Bachelor's degree in Physics from Lehman College and his Masters in Physics Education from City College of New York (CCNY). He is also a member of a network called New York City Men Teach. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 262,890 times.
Atoms can gain or lose energy when an electron moves from a higher to a lower orbit around the nucleus. Splitting the nucleus of an atom, however, releases considerably more energy than that of an electron returning to a lower orbit from a higher one. Splitting an atom is called nuclear fission, and the repeated splitting of atoms in fission is called a chain reaction. Nuclear fission is carried out in power plants in order to create energy. Scientists split atoms in order to study atoms and the smaller parts they break into. This is not a process that can be carried out at home. You can only do nuclear fission in a laboratory or nuclear plant that is properly equipped.
Things You Should Know
Splitting the nucleus of an atom releases energy.
When many atoms are split, it can lead to a chain reaction, which releases a lot of energy in the form of a massive explosion.
The process of splitting atoms is called nuclear fission.
Steps
Method 1 Method 1 of 3:
Bombarding Radioactive Isotopes
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1 Choose the right isotope. Not all isotopes are created equal when it comes to being readily split. The most common isotope of uranium has an atomic weight of 238, consisting of 92 protons and 146 neutrons, but these nuclei tend to absorb neutrons without being split into smaller nuclei of other elements. An isotope of uranium with 3 fewer neutrons, 235U, can much more readily be split apart than can 238U; such an isotope is called fissile.[1]XResearch source
When uranium splits (undergoes fission) it releases 3 neutrons that collide with other uranium atoms, thus creating a chain reaction.
Some isotopes can be split too readily, so fast that a continuous fission reaction can’t be maintained. This is called spontaneous fission; the plutonium isotope 240Pu is such an isotope, unlike the isotope 239Pu with its slower fission rate.
2 Get enough of the isotope to ensure fission will continue after the first atom is split. This requires having a certain minimum amount of the fissile isotope to make the fission reaction sustainable; this is called critical mass. Achieving critical mass requires enough of source material for the isotope to increase the chances of fission occurring.[2]XResearch source Advertisement
3 Fire one atomic nucleus of the same isotope at another. Because loose subatomic particles are difficult to come by, it’s often necessary to force them out of the atoms they’re part of. One method of doing this is firing atoms of a given isotope against other atoms of that same isotope.[3]XResearch source
This method was used to create the 235U atomic bomb dropped on Hiroshima. A gun-like weapon with a uranium core fired 235U atoms at another piece of 235U-bearing material fast enough to have the neutrons they released naturally slam into the nuclei of other 235U atoms and break them apart. The neutrons released when the atoms split would, in turn, strike and split other 235U atoms. The end result was a massive explosion.
4 Bombard the nuclei of the fissile isotope with subatomic particles. A single subatomic particle can strike an atom of 235U, splitting it into 2 separate atoms of other elements and releasing 3 neutrons. These particles can come from a moderated source (e.g. a neutron gun) or can be generated when nuclei collide. Three types of subatomic particles are commonly used.[4]XResearch source
Protons. These subatomic particles have mass and a positive charge. The number of protons in an atom determines what element the atom is.
Neutrons. These subatomic particles have the mass as protons but no charge.
Alpha particles. These particles are the nuclei of helium atoms, shorn of their orbiting electrons. They consist of 2 protons and 2 neutrons.
Advertisement Method 2 Method 2 of 3:
Compressing Radioactive Materials
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1 Obtain a critical mass of a radioactive isotope. You will need enough raw material to make sure that fission continues. Keep in mind that in a given sample of some element (plutonium for example), you will have more than 1 isotope. Make sure that you have calculated how much of the desired fissile isotope is in your sample.[5]XResearch source
2 Enrich the isotope. Sometimes, it is necessary to increase the relative amount of fissile isotope in a sample to ensure a sustainable fission reaction occurs. This is called enrichment. There are several ways to enrich radioactive materials. Some of these are:[6]XResearch source
Gas Diffusion
Centrifuge
Electromagnetic Separation
Liquid Thermal Diffusion
3 Squeeze the atomic sample tight, bringing fissile atoms closer together. Sometimes, atoms decay too fast on their own to be fired at one another. In this case, bringing the atoms closer together increases the chance of released subatomic particles striking and splitting other atoms. This can be done by using explosives to force the fissile atoms close together.239Pu atoms.[7]XResearch source
This method was used to create the 239Pu atomic bomb dropped on Nagasaki. Conventional explosives ringed a mass of plutonium; when detonated, they pushed the plutonium mass together, bringing the 239Pu atoms close enough together that the neutrons they released would continuously strike and split other plutonium atoms. This created an enormous explosion.
Advertisement Method 3 Method 3 of 3:
Splitting Atoms with a Laser
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1 Encase radioactive materials in metal. Place your radioactive material in a gold casing. Use a copper holder to fasten the casing into place. Keep in mind that both the fissile and the metals will become radioactive once fission takes place.[8]XResearch source
2 Excite electrons with laser light. With the development of petawatt (1015 watt) lasers, it is now possible to split atoms by using laser light to excite electrons in metals encasing a radioactive substance. Similarly, you could use a 50 terawatt (5 x 1012 watt) laser to excite the electrons in the metal.[9]XResearch source
3 Stop the laser. When the electrons return to their regular orbits, they release high-energy gamma radiation that penetrates the gold and copper nuclei. This will liberate neutrons from those nuclei. Those neutrons will then collide with the uranium underneath the gold splitting the uranium atoms.[10]XResearch source
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Question Can a human be split into particles like an atom? Community Answer I suppose being hit directly by something like a nuclear bomb could take a person apart on a sub-atomic level. So, yes, but it would take immense power. Thanks! We're glad this was helpful.Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 23 Helpful 98
Question If you put a a uranium 235 atom in a copper wire and add current, will the stream of electrons split the uranium atom? Community Answer It is most likely that the electrons will just be stripped of the uranium 235 atoms and it will conduct the electricity, as it is a conductor. Thanks! We're glad this was helpful.Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 17 Helpful 51
Question Can I buy an atom splitting kit at the hobby store? Community Answer Unfortunately, you can't. Even if you could, it would be very expensive. Also, splitting an atom is very dangerous, and not recommended to do at home. Thanks! We're glad this was helpful.Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 112 Helpful 140
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Warnings
This process could lead to a massive explosion. Thanks Helpful 21 Not Helpful 10
Radiation can kill you. Wear proper safety gear. Maintain a safe distance from radioactive materials. Thanks Helpful 16 Not Helpful 8
Doing this on your own is illegal. Do this only a proper facility such as a nuclear power plant or physics lab. Thanks Helpful 13 Not Helpful 12
As with any equipment, follow the required safety procedures, and don't do anything that seems risky. Thanks Helpful 11 Not Helpful 15
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Co-authored by: Joseph Quinones Physics Teacher This article was co-authored by Joseph Quinones. Joseph Quinones is a Physics Teacher working at South Bronx Community Charter High School. Joseph specializes in astronomy and astrophysics and is interested in science education and science outreach, currently practicing ways to make physics accessible to more students with the goal of bringing more students of color into the STEM fields. He has experience working on Astrophysics research projects at the Museum of Natural History (AMNH). Joseph recieved his Bachelor's degree in Physics from Lehman College and his Masters in Physics Education from City College of New York (CCNY). He is also a member of a network called New York City Men Teach. This article has been viewed 262,890 times. 135 votes - 87% Co-authors: 44Updated: July 13, 2025 Views: 262,890 Categories: Featured Articles | ChemistryArticle SummaryX
There are 3 ways to split an atom, which is also known as creating nuclear fission. For the first, you’ll need to bombard a radioactive isotope that’s easily splittable, like Uranium-235, with subatomic particles like protons or neutrons. You can also split an atom by compressing a critical mass of radioactive atoms, bringing them so close together that their subatomic particles will strike each other. If you want to learn how to split atoms using a laser, keep reading the article!Did this summary help you?YesNo
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Download Article Discover what happens when you split an atom, plus how scientists split atoms in the lab Co-authored by Joseph Quinones 
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Co-authored by: Joseph Quinones Physics Teacher This article was co-authored by Joseph Quinones. Joseph Quinones is a Physics Teacher working at South Bronx Community Charter High School. Joseph specializes in astronomy and astrophysics and is interested in science education and science outreach, currently practicing ways to make physics accessible to more students with the goal of bringing more students of color into the STEM fields. He has experience working on Astrophysics research projects at the Museum of Natural History (AMNH). Joseph recieved his Bachelor's degree in Physics from Lehman College and his Masters in Physics Education from City College of New York (CCNY). He is also a member of a network called New York City Men Teach. This article has been viewed 262,890 times. 135 votes - 87% Co-authors: 44 Updated: July 13, 2025 Views: 262,890 Categories: Featured Articles | Chemistry Article SummaryX
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1 Choose the right isotope. Not all isotopes are created equal when it comes to being readily split. The most common isotope of uranium has an atomic weight of 238, consisting of 92 protons and 146 neutrons, but these nuclei tend to absorb neutrons without being split into smaller nuclei of other elements. An isotope of uranium with 3 fewer neutrons, 235U, can much more readily be split apart than can 238U; such an isotope is called fissile.[1] 
2 Get enough of the isotope to ensure fission will continue after the first atom is split. This requires having a certain minimum amount of the fissile isotope to make the fission reaction sustainable; this is called critical mass. Achieving critical mass requires enough of source material for the isotope to increase the chances of fission occurring.[2] Advertisement 
3 Fire one atomic nucleus of the same isotope at another. Because loose subatomic particles are difficult to come by, it’s often necessary to force them out of the atoms they’re part of. One method of doing this is firing atoms of a given isotope against other atoms of that same isotope.[3] 
4 Bombard the nuclei of the fissile isotope with subatomic particles. A single subatomic particle can strike an atom of 235U, splitting it into 2 separate atoms of other elements and releasing 3 neutrons. These particles can come from a moderated source (e.g. a neutron gun) or can be generated when nuclei collide. Three types of subatomic particles are commonly used.[4] 
1 Obtain a critical mass of a radioactive isotope. You will need enough raw material to make sure that fission continues. Keep in mind that in a given sample of some element (plutonium for example), you will have more than 1 isotope. Make sure that you have calculated how much of the desired fissile isotope is in your sample.[5] 
2 Enrich the isotope. Sometimes, it is necessary to increase the relative amount of fissile isotope in a sample to ensure a sustainable fission reaction occurs. This is called enrichment. There are several ways to enrich radioactive materials. Some of these are:[6] 
3 Squeeze the atomic sample tight, bringing fissile atoms closer together. Sometimes, atoms decay too fast on their own to be fired at one another. In this case, bringing the atoms closer together increases the chance of released subatomic particles striking and splitting other atoms. This can be done by using explosives to force the fissile atoms close together.239Pu atoms.[7] 
1 Encase radioactive materials in metal. Place your radioactive material in a gold casing. Use a copper holder to fasten the casing into place. Keep in mind that both the fissile and the metals will become radioactive once fission takes place.[8] 
2 Excite electrons with laser light. With the development of petawatt (1015 watt) lasers, it is now possible to split atoms by using laser light to excite electrons in metals encasing a radioactive substance. Similarly, you could use a 50 terawatt (5 x 1012 watt) laser to excite the electrons in the metal.[9] 
3 Stop the laser. When the electrons return to their regular orbits, they release high-energy gamma radiation that penetrates the gold and copper nuclei. This will liberate neutrons from those nuclei. Those neutrons will then collide with the uranium underneath the gold splitting the uranium atoms.[10] Advertisement 
Community Answer I suppose being hit directly by something like a nuclear bomb could take a person apart on a sub-atomic level. So, yes, but it would take immense power. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 23 Helpful 98 
Community Answer It is most likely that the electrons will just be stripped of the uranium 235 atoms and it will conduct the electricity, as it is a conductor. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 17 Helpful 51 
Community Answer Unfortunately, you can't. Even if you could, it would be very expensive. Also, splitting an atom is very dangerous, and not recommended to do at home. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow Yes No Not Helpful 112 Helpful 140 
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