Com os potenciais padrão dos pares redox au+/au (+1,69v), au3+/au (+1,40) e fe3+/fe2+ (+0,77), calcule o potencial padrão e a constante de equilibrio da reação: 2fe2+ + au3+ > 2fe3+ + au+

They carry out the exchange of gases as we breathe ( oxygen and carbon dioxide).

Bar graph

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.