Russian chemist Dmitri Mendeleev ( 1834-1907) is credited with creating the periodic table of elements! He was smart enough to realize that his table was incomplete so he left blanks where he predicted that yet to be discovered elements would fit, what I find amazing about Mendeleev’s table is how it is based upon the 19th century thinking that electrons were adore little planets spinning around the nucleus.
The image was of electron “shells” layering upon each other as the complexity of the elements increased, however each row of the periodic table represents a shell while each column represents a series of elements that are chemically similar as in #29 copper (Cu), #47 silver (Ag), in addition to #71 gold (Au).
I’ve always felt sorry for #7 nitrogen (N), however she sits right next to her sister atom #8 oxygen (O) on the periodic table in addition to she is adore the plain Jane with her multiple electrons. Oxygen’s extra electron makes her the more “attractive” of the two in addition to gives her a host of chemical talents that nitrogen could never hope to duplicate such as being the essential element for life in addition to the ability to combust, but fortunately, nitrogen has her substantial roles in addition to 1 of them is to keep her more popular sister from damaging your Heating in addition to A/C system; Certain metals find oxygen irresistible. Iron will rust in addition to copper, the same material in the cooling tubes of your Heating in addition to A/C, will form the proper orangeish patina that can flake off in addition to injure your Heating in addition to A/C system. This is why a nitrogen purge is needed when a new Heating in addition to A/C plan is being installed or as area of a refrigerant recharge; Nitrogen just loves to carry that oxygen along with her into the atmosphere where she outnumbers her wayward sister by a more than three to 1 ratio.