Write the cell reaction and electrode half-reactions and calculate the standard potential of each of the following cells:.(a) Pt|Cl2(g)|HCl(aq)||K2CrO4(aq)|Ag2Cr O4(s)|Ag(b) Pt|Fe3+(aq),Fe2+(aq)||Sn4+(aq),Sn2+ (aq)|Pt(c) Cu|Cu2+(aq)||Mn2+(aq),H+(aq)|MnO2(s )|Pt

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.

Iam not going to tell you

The correct answer is weight.