Which combination can be used to classify all the matter on earth a. forces and energy b. atoms and elements c. solvents and solutes d. substances and mixtures

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.