Question

EAN count
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Answer 1

EAN = Atomic no. of element - oxidation state of metal ion + No. of Ligands

★In $(Ni (CO)_4)$

Ox. st=0

no. of Ligands=4

Atomic no. of Ni is 27

EAN=27-0+4=31

★simply solve for other one...

here oxidation state is +2

put values in formula get EAN