6.54g of zinc was reacted with excess dilute Hydrochloric acid. what will be the volume of dry Hydrogen gas at 27°c and 655mmhg​

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.