What is the $EAN$ of $Zn$ in $[Zn(NH_3)_4]^{2+}$?

What is the $EAN$ of nickel in $Ni(CO)_4$?

Which complex follows the Sidgwick $EAN$ rule (where atomic number of $M = 24$)?

$[Co(NH_3)_x]Cl_3$ has $EAN$ of $Co=36$. What is the value of '$x$' $:-$

Which of the following species can act as a reducing agent?

What is the value of $n$ in the anionic species $[V(CO)_6]^{n-}$ if it follows the Sidgwick $EAN$ rule and has an octahedral shape?