P elements, both complete and incomplete, contain a left and right end, normally depicted as pointing away from each other. Here, we examine the properties of P elements that may be described as ...

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 ...

One of the important discoveries in chemistry of the last century was the understanding of the atomic shell structure and, in turn, of the periodic properties of elements at the level of quantum ...