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When naming a transition metal ion that can have more than one common ionic charge, the numerical value of the charge is indicated by a
a. superscript after the name.
b. Suffix.
c. Prefix.
d. Roman numeral following the name.

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The answer is: d. Roman numeral following the name.

The Roman numeral shows the charge and the oxidation state of the transition metal ion.  

For example, cobalt can form two chlorides, with charge of 2+ (cobalt(II) chloride - CoCl₂) and with charge 3+ (cobalt(III) chloride - CoCl₃).

Another example, name of the compound Re₂O₅ is rhenium(V) oxide.

In this chemical compound atom of rhenium has oxidation number +5 and atom oxygen has oxidation number -2, chemical compound rhenium(V) oxide has neutral charge (2·(+5) + 5·(-2) = 0).

Roman five is for valence of rhenium in this compound.  

Transition metals are elements in the d-block of the periodic table.

When naming a transition metal ion that can have more than one common ionic charge, the numerical value of the charge is indicated by a Roman numeral following the name.

What is oxidation number?

Oxidation number of any atom tells about the number of electrons released or gained by that atom, and for releasing electrons it will be positive & for gaining electrons it will be negative.

Transition metals will show more than one oxidation state, and sometimes metals with different oxidation state will form the same compounds. So, it get difficut to us to get to know about the oxidation state of metal. For this oxidation state will shown by displaying the roman numeral after the name of the metal.

Hence option (d) is correct.

To know more about oxidation state, visit the below link:
https://brainly.com/question/13383997

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