How to Split an Atom

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Discover 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

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Splitting Atoms with a Laser

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Q&A

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Warnings

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.

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]
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- 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.
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]
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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]
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- 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]
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- 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.

Method 2

Method 2 of 3:

Compressing Radioactive Materials

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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]
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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]
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- 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]
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- 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.

Method 3

Method 3 of 3:

Splitting Atoms with a Laser

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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]
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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]
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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]
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Can a human be split into particles like an atom?

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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.

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If you put a a uranium 235 atom in a copper wire and add current, will the stream of electrons split the uranium atom?

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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.

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Can I buy an atom splitting kit at the hobby store?

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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.

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Warnings

This process could lead to a massive explosion.

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Radiation can kill you. Wear proper safety gear. Maintain a safe distance from radioactive materials.

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Doing this on your own is illegal. Do this only a proper facility such as a nuclear power plant or physics lab.

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As with any equipment, follow the required safety procedures, and don't do anything that seems risky.

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