Question

multiple - choice question
what does the roman numeral tell you?
number of cations in a compound
mass
atomic number
charge of transition metal
rewatch

Explanation:

In chemistry, when naming compounds with transition - metals, roman numerals are used to indicate the charge of the transition metal ion. For example, in iron(III) oxide, the (III) indicates that the iron ion has a + 3 charge. It is not related to the number of cations in a compound in general, nor to mass or atomic number.

Answer:

D. charge of transition metal