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出典:Wiktionary
出典:『Wiktionary』 (2025/05/23 00:12 UTC 版)
atomic mass (countable and uncountable, plural atomic masses)
Atomic mass may be measured in absolute terms, or, commonly, as a sum of the number of protons and neutrons in the nucleus.
出典:Wikipedia
出典:『Wikipedia』 (2011/04/17 00:38 UTC 版)
The atomic mass (ma) is the mass of a specific isotope, most often expressed in unified atomic mass units. The atomic mass is the total mass of protons, neutrons and electrons in a single atom (when the atom is motionless).
atomic mass