Nuclides
Definition and meaning of Nuclides in chemistry.
Nuclides are specific types of atoms defined by their exact number of protons and neutrons. Scientists use this broad term to talk about any unique atomic nucleus in nature. It clearly identifies the exact building blocks inside the center of an atom.
In more detail
People often confuse this word with the term isotope. An isotope compares different versions of one single element. For example, carbon-12 and carbon-14 are isotopes of carbon.
The word nuclide is a more general label for any specific nucleus in the universe. You can compare a carbon nuclide directly to an oxygen nuclide. Every nuclide has a specific mass number.
The mass number is the total count of protons and neutrons. A specific nuclide is usually written using the element symbol and the mass number. Tracking these exact atoms is extremely important in nuclear chemistry.
Some nuclides are completely stable and last forever. Other nuclides are radioactive and slowly break apart over time. Nuclear physicists study them to track complex radioactive decay paths.
They also use the exact proton and neutron counts to calculate nuclear binding energy. This huge energy is what holds the atomic nucleus together so tightly. Knowing the exact nuclide tells you exactly how heavy the atom is. It also tells you exactly how the atom will behave in a nuclear reactor.
Key facts
| Defining Properties | Exact number of protons and neutrons |
|---|---|
| Notation | Element symbol with a specific mass number |
| Relation to Isotopes | All isotopes are nuclides, but nuclides cover all elements |
| Stability | Nuclides can be completely stable or radioactive |
| Mass Number | The sum of the protons and neutrons |
Uranium-235 and plutonium-239 are two completely different nuclides used in nuclear power plants. Uranium has 92 protons while plutonium has 94 protons. They also have different numbers of neutrons inside their cores. Their totally different proton and neutron counts make them distinct nuclides. They have very different nuclear properties. For instance, they split apart differently when they are hit by stray flying neutrons inside a reactor.
Frequently asked questions
What is the difference between a nuclide and an isotope?
An isotope only compares atoms of the exact same element. A nuclide is a general word that can describe any specific atomic nucleus from any element.
Are all nuclides radioactive?
No. Many nuclides are perfectly stable and will never decay. The carbon-12 nuclide is stable, while the carbon-14 nuclide is radioactive.
Why do scientists need to identify specific nuclides?
It lets them calculate exact atomic weights and predict how a specific atom will act in a nuclear reaction.