The activity series shows that solid chromium will be oxidized to form
A. chromium 3+ ion
B. chromate ion
C. nothing
D. chrome

A. chromium 3+ ion

Explanation:

The activity series shows that chromium will be oxidized to chromium 3+ ions. This series shows the reactivity of each metal relative to one another.

It is used to predict the activity of metals.

                      Cr     ⇄      Cr³⁺     +      3e⁻

     The more oxidized  metals are located at the top of the series.

explanation: it gains negative electrons, therefore becoming negatively charged. as charge cannot be created, nor destroyed, only transferred, this leaves the wool positive. now that they have opposite charges, the two items attract.