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The atom is Chlorine whose electronic configuration is 2,8,1. Any element with 7 electrons in the outermost shell will have similarproperties. ... Elements in this column form what is called the Halogen series, which is composed of fluorine, chlorine, bromine, iodine, and astatine.
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The electronic configuration of an atom X is 2,8,1 then the total numbers of electrons = 2+8+1= 11. The name of the atom having atomic number 11 is sodium.
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