Atomic structure

Question 1

Define the term relative atomic mass

Answer 1

average mass of an atom/isotope (compared to C−12) on a
scale in which an atom of C−12 has a mass of 12

Question 2

State how the relative abundance of 185Re+ is determined in a TOF mass
spectrometer

Answer 2

at the detector/(negative) plate the ions/Re+ gain an electron
(relative) abundance depends on the size of the current