Here's why:
* Isotope: An isotope is a variation of an element that has the same number of protons but a different number of neutrons. This means they have the same atomic number but a different atomic mass.
* Radioactive: The term "radioactive" describes atoms whose nuclei are unstable. This instability causes them to spontaneously decay, releasing particles and energy in the process.
Types of Radioactive Decay:
There are several types of radioactive decay, including:
* Alpha decay: An alpha particle (containing two protons and two neutrons) is emitted from the nucleus.
* Beta decay: A beta particle (an electron or positron) is emitted from the nucleus.
* Gamma decay: High-energy photons (gamma rays) are emitted from the nucleus.
Why are Some Atoms Radioactive?
Radioactivity arises from the imbalance between protons and neutrons in the nucleus. If the nucleus has too many or too few neutrons, it becomes unstable. To achieve stability, the nucleus undergoes radioactive decay.
Examples of Radioisotopes:
* Carbon-14: Used in carbon dating to determine the age of ancient artifacts.
* Iodine-131: Used in medical treatments for thyroid conditions.
* Uranium-235: Used as fuel in nuclear power plants.
Let me know if you have any other questions!
