| 释义 |
同位素tóngwèisù同一元素中质子数相同、中子数不同的各种原子互为同位素。它们的原子序数相同,在元素周期表上占同一位置。如氢有氕、氘、氚三种同位素。{isotope; one of two or more atoms in the same element in which the nuclei have the same number of protons but different numbers of neutrons. They are characterized by the same atomic number, and occupy the same position on the periodic table of elements, e.g. protium, deuterium and tritium are three isotopes of hydrogen.} |