Calculate number of neutrons present in 12*10^25 atoms of oxygen whose atomic no. is 8 and mass no. is 17
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The number of neutrons ,N=A-Z=(17–8)=9. So, there are 9 neutrons in an Oxygen atoms. We have been asked to find the number of neutrons in 12x10^25 Oxygen atoms. It is not difficult to see that this number is (12x10^25)x9.
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