Answer :
The number of ligands attached to the central metal atom/ion is referred to as the coordination number.
The electrons in d sub shell are six electrons .
What is meant by coordination compounds?
Coordination compound is the class of substance with chemical structures in which a central metal atom is surrounded by non metal atoms or groups of atoms called ligands, joined to it by chemical bonds.
Properties of chemical compounds are colour, magnetic, susceptibility, solubility and volatility, an ability to undergo oxidation reduction reaction and catalytic activity.
In the given compound the electronic configuration of Rh is 4d⁸5s¹.
x + 6(-1) = -3
Simplifying the above equation, we get
x = 3
Now the electronic configuration of Rh is 4d⁶ only.
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