When aluminum, al, metal is dipped in an aqueous solution of hydrochloric acid, hcl, hydrogen gas, h2, is produced with the formation of an aluminum chloride, alcl3, solution. write the balanced chemical equation showing the phases of reactants and products.

Al(s) + 3HCl(aq) → AlCl₃(aq) + 3/2H₂(g).

Explanation:

So, the balanced equation is:

Al(s) + 3HCl(aq) → AlCl₃(aq) + 3/2H₂(g).

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.