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

User RStyle
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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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