At 300 k the pressure inside a gas filled container is 500 kpa if the pressure inside decreses to 100kpa but the volume remains the same what is the final temperature of the gas

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.