词条mass number在英语 » 德语中的译文

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mass number 名词

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mass number 物理

Massenzahl f

单语范例（未经PONS编辑处理）

英语

Two nuclides that have the same mass number (isobars) can both be stable only if their atomic numbers differ by more than one.

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The isotopes of praseodymium range in mass number from 121 to 159.

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The "m" refers to the molecular or atomic mass number and "z" to the charge number of the ion.

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Correspondingly, isobars differ in atomic number (or number of protons) but have the same mass number.

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Both decay modes do not change the mass number, hence an original nucleus and its daughter nucleus are isobars.

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The isotopes of plutonium range in mass number from 228 to 247.

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This convention is easier to use in chemical equations, replacing the need to write out the mass number for each atom.

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