What is the oxidizing agent in the reaction fe + agno3 fe(no3)3 + ag?

Answer;
             Silver is acting as oxidizing Agent.

Explanation:

The reaction is as follow,

                              Fe + 3 AgNo₃    →     Fe(NO₃)₃ + 3 Ag

In above reaction the Iron's oxidation state has changed from 0 to +3, i.e. 

                             Fe⁰      →     Fe³⁺  +  3 e⁻

It shows that Iron has lost 3 electrons, Hence, it is oxidized and has transferred 3 electrons to 3 mole of Ag⁺ to reduce it into Ag. Therefore, Iron is acting as reducing Agent.

While, In reaction the Silver's oxidation state has changed from +1 to 0, i.e. 

                             3 Ag⁺  +  3 e⁻     →     3 Ag

It shows that Silver has gained one electron, Hence, it is reduced and has gained 3 electrons from 1 mole of Fe to oxidize it into Fe³⁺. Therefore, Silver is acting as oxidizing Agent.

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

Are you going to give an example of the plant or?