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[" The atomic numbers of elements "X,Y" and "Z" are "19,21" and "25" respectively.TI "],[" number of electrons present in the "M" - shell of these elements follow the orde "],[" 1) "Z>X>Yquad " 2) "X>Y>Zquad " 3) "Z>Y>Xquad " 4) "Y>Z>X]

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