B. Explain the trend in Question 2a. (Comparing the element at the top of the group with the element at the bottom of the group, what happens to the value of n for the valence electron? What does n inform
us of? What kind of force exists between an electron in the valence shell and the electrons in the core
shells?

Sorry i dont understand the question can you rephase it?

Answer is: the equilibrium  shifts toward the reactants, to the left side of chemical reaction.it is because lead(ii) nitrate dissociates in water: pb(no₃)₂ → pb²⁺(aq) + 2no₃⁻(aq).according to lechatelier's principle, the position of equilibrium moves to counteract thechange (more lead cations, common ion), the position of equilibrium will move so that the concentration ofproducts decrease and concentration of reactants of chemical reaction increase.read more on -

It starts to rust i think

The answer is b. because when it leaves the bat, its bringing motion on where its going.