官方APP下载:英语全能特训(微信小程序版,支持苹果手机、安卓手机)
创办于2003年
UNSV记不住?那就记中文谐音“忧安思危”吧!
  Slow and Steady Wins the Race!
UNSV英语学习频道 - Slow and steady wins the race!

英语全能特训(微信小程序)
UNSV英语学习频道淘宝网店
客服短信:18913948480
客服邮箱:web@unsv.com
初级VIP会员
全站英语学习资料下载。
¥98元/12个月

SCIENCE IN THE NEWS - Remember Your Chemistry Classes?

阅读次数:


VIP会员专享下载:(非VIP会员无权下载!如果想下载,但还不是VIP会员,请点此订购
下载方式:使用鼠标右键(注意是鼠标右键!)点击下面的MP3音频/MP4视频链接,然后选择“另存为…”。
MP3节目录音 MP3节目录音  PDF节目文稿 PDF节目文稿  MP3同步字幕 MP3同步字幕 
文章正文
同步字幕
Remember Your Chemistry Classes?
Remember Your Chemistry Classes?

An international team of researchers recently reported creation of a new element that is 40 percent heavier than lead.

The researchers successfully developed what they are calling Element Number 117 at a laboratory in Germany. It is identified by that number because its nucleus contains that same number of particles --called protons. Element Number 117 has a temporary name -- ununseptium.

If you remember your chemistry classes in school, you will recall that about 90 elements in the Periodic Table are found in nature. But others that were created in laboratories appear only in very small amounts.

The Periodic Table lines up -- or organizes -- chemical elements in order of atomic number. The elements made in laboratories -- such as 117 -- are extremely unstable. They last only minutes before breaking down into long-lasting elements.

Creation of new elements helps scientists better-understand the chemistry and physics of atoms. But such production may also lead to the discovery of new technologies.

Russian and other scientists had reported the creation of Element 117 in 2010. But the group that confirms new elements requires at least two successful independent experiments to confirm their existence. That group -- the International Union of Pure and Applied Chemistry -- will give the element a permanent name.

A report on the new element appears in the journal Physical Review Letters.

This story was narrated by Anna Matteo and Christopher Cruise. It was written in Special English by Jerilyn Watson from a story by VOA reporter George Putic in Washington.

网友的学习评论(0条):
版权所有©2003-2019 南京通享科技有限公司,保留所有权利。未经书面许可,严禁转载本站内容,违者追究法律责任。 互联网经营ICP证:苏B2-20120186
网站备案:苏ICP备05000269号-1中国工业和信息化部网站备案查询
广播台