Which of the following statements about ionization energy is true? . a. in a period, elements farther to the right generally have lower ionization energies than elements on the left. b. elements toward the bottom of a group periodic table generally have higher ionization energies than elements at the top of the group. c. ionization energy is the amount of energy used to add an electron to an atom. d. potassium has a lower ionization energy than sodium.

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano. the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? positive force → balanced force → negative force negative force → balanced force → positive force positive force → unbalanced force → negative force negative force → unbalanced force → positive force