If 5 moles of Al are put in a copper (II) chloride solution, how many mole of Cu will come out?

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.

let that person have a turn to speak : )