isotope
isotope 英 [ˈaɪsətəʊp] 美 [ˈaɪsətoʊp]
n. 同位素
名词复数:isotopes
- An isotope of a chemical element is an atom that has a different number of neutrons (that is, a greater or lesser atomic mass) than the standard for that element.
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- n. 同位素
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1. But the team found that on the Moon it was about 25 times that of the terrestrial chlorine isotope ratio.
但是研究团队发现在月球上氯的同位素的比率大约是地球上的25倍。
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2. However, there is a very attractive reaction between deuterium and a light isotope of helium known as helium-3.
无论如何，在氘和一个氦的轻同位素也就是氦-3之间有一种吸引人的反应。
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3. When we count up the lithium atoms held in stars, there is only one-third as much of the lithium-7 isotope as there should be.
当我们算出了在各个恒星中锂原子的总数，同位素锂-7的总量仅是在那里应有量的三分之一。
- isotope (n.) 1913, literally "having the same place," from Greek isos "equal" (see iso-) + topos "place" (see topos); so called because, despite having different atomic weights, the various forms of an element occupy the same place on the periodic table. Introduced by British chemist Frederick Soddy (1877-1956) on suggestion of his friend, the Scottish writer and doctor Margaret Todd (c. 1859-1918). Related: Isotopic.
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