Isomer
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Isomer
</dt>
1. One of two or more nuclides
having the same mass number
A and atomic
number Z, but existing for measurable times in different quantum states
with different energies and radioactive properties.
</dd>
The state of lowest energy is the ground state. Those of higher
energies are metastable states. To indicate the metastable isomer, the letter
m is added to the mass number in the symbol for the nuclide; thus Br80mCommonly, the isomer of higher energy decays to
one with lower energy by the process of isometric
transition.
</dd>
2. One of two or more molecules
having the same atomic composition and molecular weight, but differing in
geometrical configuration. [[/a>|/a>
]]
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
