Uncertainty about relative atomic mass

[Neutroniclad]

For the uncertainty about relative atomic mass.
Such as for H-1 there is 1.00794(7)u.
what exactly does the "7"means?
Is it 1.007947? or 1.00794(+/-)0.000007? or something else?
ref: http://www.ciaaw.org/pubs/TSAW-2007.pdf

 

[DrClaude]

Is it 1.007947? or 1.00794(+/-)0.000007?

Neither. It is the uncertainty in the last digit, so 1.00794 ± 0.00007. (You had a zero too many.)