"All atoms of the same element are identical; Different elements have different types of atoms." Is this statement still true?

It’s b. mass i searched it up

The answer will be c

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 -

"form only at boundaries  between two continental plates." this is the correct answer.