早在初中的化学课上,我们就知道 同位素是同一元素的不同原子,它们具有相同数目的质子(及电子),却有不同数目的中子。例如,氢有三种同位素: 氢、氘和氚。同位素可分为稳定同位素(如碳、氢、氧、氮、硫等元素)及放射性同位素(如铅和钋等元素)、轻同位素(如碳元素)和重同位素(如? As early as junior high school chemistry class, we know that isotopes are different atoms of the same element, they have the same number of protons (and electrons), but a different number of neutrons. For example, hydrogen has three isotopes: hydrogen, deuterium, and tritium. Isotopes can be divided into stable isotopes (such as carbon, hydrogen, oxygen, nitrogen, sulfur and other elements) and radioisotopes (such as lead and polonium), light isotopes (such as carbon) and heavy isotopes