Respuesta :
Answer:
B. Energy
Explanation: To pull an electron of outer shell of atom less energy is required. Because work done in pulling electron from outer shell is less( as attraction is weak ) in comparison to work done in pulling an electron from inner shell ( attraction with nucleus is strong). The energy needed to pull out an electron from an atom can be explained by ionization energy. Which means farther the electron is from the nucleus more energy it has.
