Calculation of half-life
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The atomic mass of an element is the average relative mass of its atoms as compared with an atom of carbon-12 whose mass is taken as 12. In terms of percentages of different isotopes, the average atomic mass can be determined as follows: = ∑(
X
)/100. Where,
is the percentage abundance of isotope with atomic number
.
So, average atomic mass of neon = = 20.177 amu.