n.钫(放射性化学元素)

Francium is a highly radioactive element with the atomic number 87.
镭是一种具有87号原子序的极度放射性元素。
The discovery of francium was announced by Marie and Pierre Curie in 1898.
镭元素于1898年由玛丽和皮埃尔·居里夫妇宣布发现。
Francium has the lowest melting point of all the elements on the periodic table.
镭是周期表上所有元素中熔点最低的。
A small amount of francium decays into a gas every second in a laboratory setting.
实验室环境中，镭每秒钟都会有一小部分衰变为气体。
The fleeting existence of francium makes it challenging to study in laboratories.
镭的存在极其短暂，这使得在实验室对其进行研究极具挑战性。
The element francium is named after the country France, where the Curies conducted their pioneering work.
镭这个元素是以法国命名的，因为居里夫妇在那里进行了开创性的研究。
Francium's brilliant red glow under certain conditions is due to its radioactivity.
镭在特定条件下发出的鲜艳红色光源于其放射性。
Scientists use extremely short-lived francium isotopes for precise atomic clock calibrations.
科学家利用寿命极短的镭同位素进行精确的原子钟校准。
In nature, francium is found only in trace amounts, primarily as an alpha decay product of actinium-227.
在自然界中，镭仅以极微量存在，主要作为镭-227的α衰变产物。
The study of francium has contributed to our understanding of nuclear reactions at the smallest scales.
对镭的研究有助于我们理解最小尺度下的核反应。