(a) The nucleus of the normal helium isotope (4He), consisting of two protons and two neutrons; an alpha-particle. (b) The nucleus of the helium…
| 单词 | θ79564 |
| 释义 | the world > matter > physics > atomic nucleus > radioactive isotope > specific isotopes > [noun] > nucleus of helium isotope (1) helion1930 (a) The nucleus of the normal helium isotope (4He), consisting of two protons and two neutrons; an alpha-particle. (b) The nucleus of the helium… |
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