What is the number of neutrons of mercury ?

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javdolls

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80 protons/neutrons atomic mass 200.5
do you round the atomic mass or do you just cut off the decimals?
 
There are different isotopes, each with different numbers of neutrons.

If you subtract the atomic no. of Hg (which is 80) from 200.5, you get (near enough) 120.5 for the average. But as you have correctly reasoned, you can't have half a neutron.

Lots of elements have only one stable isotope (e.g. F), or consist almost entirely on one isotope (e.g. O, N), so they have atomic masses very close toa whole number. If the atomic mass is a log way from a whole number, you can be sure that there are different isotopes.
 
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