ChemStd 11.C Some naturally occuring isotopes of elements are radioactive, as are isotopes formed in nuclear reactions
A chemical elementt is a pure chemical substance consisting of one type of atom.
Isotopes are any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in the nucleus, or different atomic weights. Most naturally occurring elements have more than one stable isotopes. Certain elements only have radioactive isotopes.
The elements without any stable isotopes are technetium (atomic number 43), promethium (atomic number 61), and the elements with atomic numbers greater than 82. Stable isotopes are chemical isotopes that are not radioactive.
Nuclear fusion is the process by which multiple atomic particles join together to form a heavier nucleus. It is accompanied by the release or absorption of energy.
Nuclear fission is a nuclear reaction in which the nucleus of an atom splits into smaller part
A nuclear reaction is the process in which two nuclei or nuclear particles collide to produce products different from the initial particles.
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