Question

What is the isotopic abundance of 25Mg?

Answer 1

78.70%

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Answer 2

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Samples of known isotopic composition, prepared from nearly pure separated magnesium isotopes, were used to calibrate the mass spectrometers. The resulting absolute values are ²⁵Mg/²⁴Mg = 0.12663 ±0.00013 and ²⁶Mg/²⁴Mg = 0.13932 ± 0.00026, yielding an atomic weight (¹²C = 12) of 24.30497 ±0.00044.

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