| 单词 | mass number |
| 释义 | > as lemmasmass number mass number n. Nuclear Physics the total number of protons and neutrons in an atomic nucleus. ΘΚΠ the world > matter > physics > atomic nucleus > [noun] > sum of protons and neutrons in mass mass number1923 1923 F. W. Aston in London, Edinb., & Dublin Philos. Mag. 6th Ser. 45 945 These integers are provisionally called ‘mass-numbers’. The mass-number may be taken to represent the number of protons in the atom. 1946 Electronic Engin. 18 153/2 The separation of the uranium isotope of mass number 235..from that of mass number 238..constituted one of the major investigations in the development of the atomic bomb. 1989 A. C. Davies Sci. & Pract. Welding (ed. 9) I. i. 2 In the periodic classification, the elements are arranged in order of their mass numbers. < as lemmas |
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