質量数 (しつりょうすう) Japanese meaning | KotomoraMeanings
1
noun
mass number
physicschemistry
Technical term in physics and chemistry; the total number of protons and neutrons in an atomic nucleus.
substance, quality, matter
量quantity, measure, weight Similar words
- 原子番号
原子番号 is the atomic number (number of protons), while 質量数 is the mass number (protons + neutrons).
- 原子量
原子量 is the atomic weight (average mass of isotopes), whereas 質量数 is an integer count for a specific isotope.
Etymology
Compound of 質量 (mass) and 数 (number), a straightforward calque from English 'mass number'.
