and atomic radius. Many scientists worked on the problem of organizing the elements, but Dmitri Mendeleev published his first version of the periodic table in 1869, and is most often credited as its ...

Even though emeralds and rubies are very different colors, they both have the same secret ingredient in their atomic ...

Chemistry has a central role in science ... we are now able to elucidate the precise atomic-level structures of large biomolecules such as DNA, RNA, proteins and polysaccharides.