Select an element from the periodic table to load its detector trace. Each peak is an isotope — its position is mass, its height is relative abundance. Toggle isotopes off to see how the weighted average shifts.
Quiz mode
Select element
available (stable isotopes on record)no stable isotope data
Pick an element to fire up the detector →
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Z = —
m/z (mass-to-charge ratio)
Live weighted average (selected isotopes)
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Accepted atomic mass (all isotopes)
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Isotope
Mass (amu)
Abundance
Contribution
Try this: uncheck the least-abundant isotope. Notice the live average barely moves — a rare isotope contributes little mass even though it's chemically identical. Now uncheck the most-abundant isotope instead and watch the average swing hard.