Which statement best explains how periods on the periodic table are organized? A. decreasing number of electrons from left to right

B. decreasing atomic mass number from left to right

C. increasing number of neutrons from left to right

D. increasing atomic number from left to right

D. most models represent a real world object in a simpler way

Sorry i dont understand the question can you rephase it?

In reversible reaction chemistry equilibrium is attained when the forward and reverse reactions are taking place at the same rate, thus, the concentrations of reactants and products remain the same. a reversible reaction is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back. in irreversible reactions on the other hand, the reactants react to form the products, which cannot revert back into reactants.