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How many neutrons does the most common isotope of potassium have?

What is the number of neutrons in the most common isotope of selenium?

  • How many neutrons are in the most common isotope in the element selenium? (easier to understand) - Mandi , GA

  • Answer:

    The most common isotope of selenium is Se-80, which would have 46 neutrons. There are actually 5 stable isomers of selenium, and a sixth with a very long half-life. The atomic mass of selenium in the Periodic Table is 78.96 amu, but Se-79, the closest isotope to that weight, is actually unstable.

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JoDe

Selenium has at least 29 isotopes, of which 5 are stable, and 6 are nuclear isomers. (80Se 49.61% Se is stable with 46 neutrons . 76Se 9.36% Se is stable with 42 neutrons 77Se 7.63% Se is stable with 43 neutrons 78Se 23.78% Se is stable with 44 neutrons 74Se 0.87% Se is stable with 40 neutrons )

jdsheth2004

45. Se has atomic number 34 and mass number 79. Thus the number of neutrons=79-34=45. So there are 45 neutrons in Se.

malukollam20

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