What is shielding shell and shielding electrons of Aluminum 13 and rubidium 37?

Looking for (disambiguation) .Aluminum (aluminum in American and Canadian English) is a chemical element with the symbol Al and atomic number 13. Aluminum has a lower density than other common metals, approximately one-third that of steel. It has a great affinity for oxygen, and forms a protective oxide layer on the surface when exposed to air. Aluminum visually resembles silver, both in color and in its extraordinary ability to reflect light. It is soft, non-magnetic and ductile. It has one stable isotope, 27 Al; This isotope is very common, making aluminum the twelfth most common element in the universe. The radioactivity of 26 Al is used in radiodating.

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Ithink it’s one of those things that you put the object on