write the names of 36 radioactive elements
Answers
Explanation:
hydrogen-3 1 + 2 12.32
beryllium-10 4 + 6 1.39 million
carbon-14 6 + 8 5,700
sodium-22 11 + 11 2.605
silicon-32 14 + 18 150
chlorine-36 17 + 19 301,000
argon-39 18 + 21 269
krypton-81 36 + 45 229,000
iodine-129 53 + 76 15.7 million
Answer:
Examples of Naturally Occurring Radioactive Elements
Whether a particular element is stable or not depends on the number of neutrons in the nucleus.
For example, any nucleus with six protons is a carbon nucleus. If the carbon nucleus also contains six or seven neutrons, it will be stable: hence carbon-12 and carbon-13 are not radioactive. If, however, the nucleus contains eight neutrons, it will be unstable: hence carbon-14 is radioactive.
Using particle accelerators, elements and isotopes can be made that do not occur in nature. Here we will only consider naturally occurring nuclei with half-lives of more than 1 year.
First, here are examples of nuclei produced by the action of cosmic rays on Earth's atmosphere - these are called cosmogenic isotopes.
List of Naturally Occurring
Cosmogenic Radioactive Isotopes
Isotope Protons + Neutrons Half Life/years
hydrogen-3 1 + 2 12.32
beryllium-10 4 + 6 1.39 million
carbon-14 6 + 8 5,700
sodium-22 11 + 11 2.605
silicon-32 14 + 18 150
chlorine-36 17 + 19 301,000
argon-39 18 + 21 269
krypton-81 36 + 45 229,000
iodine-129 53 + 76 15.7 million
Next, here are the radioactive nuclei that have survived since the formation of the Solar System. These isotopes, called primordial isotopes, have, of course, extremely long half-lives.
Explanation: