Everything on Earth that scientists can see, measure or study is made of atoms and atoms are named by what types of elements (元素)they are. You probably know the name of many elements, such as oxygen or hydrogen. In any case, elements are everywhere: You, your -shoes, your desk, cars, water and air are all made of elements.
Now, there's a new kind on the block: copernicium.
This element was officially named on February 19,but the element itself isn't new. German scientists made and observed it in 1996. But in the 14 years since then, other scientists have been working to study and validate (证实)the original findings. Validation is an important part of the scientific process because it shows that a scientific discovery was not a mistake.
All that hard work finally paid off when the element finally received its name, copernicium, from the International Union of Pure and Applied Chemistry. Copernicium is named in honour of Nicolaus Copernicus (哥白尼),a 16th century Polish scholar who proposed that the earth moves around the sun and that the earth turns on its own axis.
Scientists organize all the elements on a chart called the Periodic Table. Each element gets a symbol and its own number, and copernicium gets the symbol Cn and the number 112. This number means that inside every atom of copernicium are 112 protons (质子). The lightest element hydrogen has only one proton inside each atom. Its 112 protons make copernicium the heaviest known element with a name. It was first observed by Sigurd Hofmann»a scientist in Germany. In 1996, Hofmann and his team had to figure out a way to get all the protons together and stick. They used a machine that can speed up atoms up to 10 percent the speed of light. After a week of working on these high-speed collisions(碰撞),Hofmann's team found copernicium even though it quickly disappeared.
Now, 14 years after Hofmann's experiment, other scientists are able to make copernicium and validate Hofmann's original work. Scientists are excited about copernicium. If such a super heavy atom can be created, then even heavier elements might be waiting in the future. "One of the exciting things is, how far can we keep going?" says nuclear chemist Paul Karol.
What do we know about copernicium?
A.It is the heaviest element so far. |
B.It was officially named in 1996. |
C.It is a newly-discovered element. |
D.It is the most difficult element to validate. |
Why is copernicium named after Nicolaus Copernicus?
A.Because he proved the existence of the element. |
B.It is named in honour of Nicolaus Copernicus. |
C.Because he observed the element in the 16th century. |
D.Because he designed the Periodic Table for all the elements. |
By asking “how far can we keep going?” Karol means ________ .
A.how many elements people can find in the future |
B.how soon people can find another new heavy element |
C.how long people can walk carrying the heavy element |
D.how long people can continue to research into copernicium |
What is the best title for the passage?
A.A New Element Has Been Discovered |
B.The Periodic Table Is Changed Again |
C.The Heaviest Named Element Is Official |
D.Superheavy Copernicium Needs Its Place |