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[" Where a,b,c,d,e,"f,g,h" are "3^(" th ...

[" Where a,b,c,d,e,"f,g,h" are "3^(" th ")" period elements.If difference between "],[" atomic number of elements "b" and "e" is "x" and difference between atomic "],[" number of elements "c" and "f" is "y." What is the value of "x-y.]

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