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Sagot :
Answer:
20.1797 u
Neon/Atomic mass
The relative atomic masses given in periodic table entries are calculated for all of each element's naturally occurring isotopes, weighted by their abundance on Earth. Asteroids and meteors, for example, can have very different isotope abundances. Hence, the atomic mass of Neon is 20.18 amu.
Explanation:
Answer:
abundance of the first isotope times the Mass of the first isotope
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