Valence electrons in an atom of phosphorus are closer to the nucleus than the valence electrons of aluminum because:
(A) P has a greater effective nuclear charge and a greater shielding than Al.
(B) P has a greater effective nuclear charge with the same shielding as Al.
(C) P has the same effective nuclear charge with greater shielding than Al.
(D) P has the same effective nuclear charge and the same shielding as Al.

Is there any options, for this

Answerit is not a renewable energy source;

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.