As for larger atomic clocks, current models measure the interaction of microwaves with electrically charged atoms, or ions, to measure one second.

对于较大的原子钟而言，当前的方法是以测量带电原子或离子发出的微波干涉方法确定一秒种的长度。

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Physicists have no trouble using, on the one hand, picoseconds (trillionths of a second) or even femtoseconds (quadrillionths of a second) to discuss time at the atomic scale.

在讨论原子级别时间的时候，物理学家用起皮秒（百万兆分之一秒）甚至飞秒（千万亿分之一秒）来都没任何不便。 这是一方面。

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Eastern time, atomic clocks around the world will add one second to the day.

本周三晚23点59分59秒(美国东部时间早6点59分59秒)，全世界所有的原子钟会把这一天拨慢一秒。

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These are all isoelectronic, they all have the same electron configuration. And we can also think about going back to atomic size for a second.

这些都是等电子的，它们都有相同的电子排布，而,我们还可以再回想一下原子尺寸的概念。

麻省理工公开课 - 化学原理课程节选

And now we're asking you to look at krypton, so the atomic mass is 36. You can actually just grab that handout the second handout on the exam and look at the periodic table there. So, which of the following ions listed is isoelectronic with krypton?

现在我们请大家来看一下氪原子，它的原子量是，36，大家其实可以拿出这张讲义,第二份关于考试的讲义,看一下上面的周期表，那么，下列离子中，哪一个是与氪原子是等电子的？

麻省理工公开课 - 化学原理课程节选

Here is a 2py atomic orbital, and it will react with a second 2py atomic orbital.

这是2py原子轨道，与另外那个2py轨道作用。

麻省理工公开课 - 固态化学导论课程节选

Radioactivity is measured in Becquerels, which convey the disintegration of an atomic nucleus per second.

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Three days later a second atomic bomb was dropped on Nagasaki, and Japan surrendered unconditionally six days after that.

ECONOMIST: Thomas Ferebee | The

Then there is the Manhattan Project, the name given to America's development of the atomic bomb during the second world war.

ECONOMIST: William Sunderman