If the concentration of Sn2 Sn2 in the cathode compartment is 1.30 MM and the cell generates an emf of 0.21 VV , what is the concentration of Pb2 Pb2 in the anode compartment

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

the answer is a and have a great day