Atoms, Ions and Compounds (OCR A-Level Chemistry A): Flashcards

Exactly 12 atomic mass units (12 $u$)

$\frac{1}{12}$ of one C-12 atom mass

Mass of isotope vs $\frac{1}{12}$ C-12, dimensionless

Weighted mean mass vs $\frac{1}{12}$ C-12, dimensionless

Accounts for % abundance & mass of each isotope

Mass-to-charge ratio of ion

% abundances of isotopes

$\frac{\sum(\text{abundance} \times \text{mass})}{100}$

Move slower, harder to deflect than lighter ions

% abundance of that isotope