How is the oxidation state of a transition metal determined from the chemical formula?

A. A superscript on the transition metal identifies its oxidation state
in the formula.
B. The subscript of the transition metal in the formula identifies its
oxidation state.

C. A Roman numeral placed after the transition metal identifies its
oxidation state.

D. The total charge of the negative ion identifies the oxidation state
of the transition metal.

A. A superscript on the transition metal identifies its oxidation state

in the formula.

Explanation:

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we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

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