An elemnt with 56 nucleons in nucleus and if it is isotonic with y^60 which grop and period does it belong to
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Iron having number of nucleon as 56 and it is isoelectronic with y^60.
Y having number of nucleon as 60 which indicates it is Cobalt as mass number of cobalt is 60. Now, iron-56 get isoelectronic with Co-60 which indicates number of electron of iron become equivalent to cobalt. Thus, iron accepts an electron to become Fe-. Now, this Fe- belongs to same period-3 with group number 9.
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