Postsecondary • 1mo.
why is the mass number not right is it because it’s an ion and not a neutral atom, what is the right answer and how do I get there
why is the mass number not right is it because it’s an ion and not a neutral atom, what is the right answer and how do I get there
Explanation from Alloprof
This Explanation was submitted by a member of the Alloprof team.
Hello EfficientEagle2708, thanks for your question !
I think gave the relative atomic mass, which is the atomic mass of an atom depending on the mass of the \(\ce{^{12}C}\) isotop.
I think it was expected that you'd calculate the atomic mass of the selenium using the mass of protons and neutrons.
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Or, maybe your teacher were referring to the average atomic mass instead of the relative atomic mass :
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Anyway, I'd say i find this question pretty misleading and i wouldn't hesitate to ask my teacher to clarify about their expectations.
Here's the link where I found thoses images : https://www.alloprof.qc.ca/en/students/vl/sciences/atomic-mass-and-isotopes-s1121
I hope I was able to help, have a good day !