What is the average velocity of a 990kg car that takes 12 hours to travel to a position 600km north of its starting position?
85 POINTS!!!

Mass is not required

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.