One hundred fifty years after Russian chemist Dmitri Mendeleev published his system for neatly arranging the elements, the periodic table it gave birth to hangs in every chemistry classroom in the ...
Scientists tried to solve the mystery of the helium nucleus — and ended up more confused than ever
Helium is the simplest element in the periodic table with more than one particle in its nucleus, yet state of the art theory and experiments on it don't add up. When you purchase through links on our ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results