Пожалуйста помогите перевести текст в по смыслу, кто разбирается:
Molecules all vary in size, depending upon the number and size of the atoms which compose them. They vary from simple ones consisting of two atoms such as the hydrogen molecules, to complex ones, like those of stars, some of which contain as many as 2500 atoms. Protein molecules are even larger than this.
Not all the atoms weigh the same amount. From the way atoms act, scientists have been able to compare their weight and list them in a table beginning with the lightest and ending with the heaviest. Such a table was created in 1869 by D.I.Mendeleyev, the great Russian scientist.
Hydrogen, the gas used in toy balloons, is very light. Uranium, the ore used for atomic energy production, is the heaviest, and its atom is the last in the table of atoms that exist naturally. Heavier ones which follow uranium in the table have been made by man.
The practical uses of nuclear energy are based on a knowledge of the structure of matter. Our knowledge of the internal structure of the atom is a twentieth century achievement. It is extremely new, so new in fact, that physicists realize that far more remains to be found out than has already been discovered. Yet that knowledge has already played an important part in the advance of chemistry and industry, and most recently in the peaceful use of atomic energy.