Yes, I asked which is the lightest element in the periodic table.

是的，我问元素周期表中最轻的元素是什么。

Denied. All right, for ten points, What is the lightest element on Earth, with no stable isotope?

驳回。接下来十分题，地球上没有稳定同位素的最轻的物质是什么？

Over billions of years, this stripped a lot of the lighter elements from the atmosphere, as well as all of the water.

在数十亿年的时间里，太阳风把许多较轻的元素和水剥离出大气层。

That's how the lightest, most abundant elements on the periodic table were created.

这就是元素周期表上最轻、最丰富的元素是如何产生的。

There is a lot of heat now, ten billion degrees of it, enough to begin the nuclear reactions that create the lighter elements principally hydrogen and helium, with a dash (about one atom in a hundred million) of lithium.

这时候产生了大量热量，温度高达1000万摄氏度，足以引发核反应，其结果是创造出较轻的元素主要是氢和氦，还有少量锂（大约是1000万个原子中有1个锂原子）。