Which of the following is a balanced chemical equation for the reaction of magnesium with nitrogen gas to form magnesium nitride

take a better picture and ill do it

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.