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13 October, 09:08

To how many significant figures would you need to express the mass of an hydrogen-1 atom in

amu

to notice the change in mass that occurs when it gains an electron

+5
Answers (1)
  1. 13 October, 09:14
    0
    Five significant figures

    Mass of H-1 atom = 1.0078 u

    Mass of electron = 0.0006 u

    Total mass = 1.0084 u

    You would have to express the mass of a hydrogen atom as 1.0078 u (five significant figures) to notice the change in mass as it gains an electron.
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