Final answer:
The reducing agent in the reaction is Rb and the oxidizing agent is Br².The species that undergoes oxidation is Rb(s) because its oxidation state increases from 0 to +1 in RbBr(s). The species that undergoes reduction is Br2(g) because its oxidation state decreases from 0 to -1 in RbBr(s).
Step-by-step explanation:
In the reaction
2Rb(s) + Br²(g) → 2RbBr(s),
the reducing agent is Rb and the oxidizing agent is Br². The species that undergoes oxidation is Rb(s) because its oxidation state increases from 0 to +1 in RbBr(s). The species that undergoes reduction is Br2(g) because its oxidation state decreases from 0 to -1 in RbBr(s). So, the oxidizing agent is Br². (bromine) and the reducing agent is Rb (rubidium).
The species that undergoes oxidation is Rb(s) because its oxidation state increases from 0 to +1 in RbBr(s). The species that undergoes reduction is Br2(g) because its oxidation state decreases from 0 to -1 in RbBr(s). The reducing agent in the reaction is Rb and the oxidizing agent is Br².