| 21. | The Dalton ( Da ) is another name for the unified atomic mass unit.
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| 22. | Samples of these elements therefore may serve as reference standards for certain atomic mass values.
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| 23. | Germanium has five naturally occurring isotopes ranging in atomic mass number from 70 to 76.
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| 24. | This single nuclide will have a characteristic atomic mass.
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| 25. | Its relative atomic mass should be around 445 u.
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| 26. | Atomic mass figures are thus commonly reported to many more significant figures than atomic weights.
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| 27. | The desorbing NO was measured using a mass spectrometer monitoring the atomic mass of 30.
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| 28. | There are 21 known radioisotopes with atomic masses ranging from 232 Cm to 252 Cm.
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| 29. | An accurate atomic mass for samples of lithium cannot be measured for all sources of lithium.
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| 30. | Dysprosium also has at least 11 metastable isomers, ranging in atomic mass from 140 to 165.
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