Which form of energy is used as a roller coaster moves down the track? a roller coaster moving down a track

Chemical energy
Light energy
Mechanical energy
Solar energy

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.