Answer: Percy can't get back at Nancy when she starts teasing Grover on the bus because he has been warned that he will be thrown out of school if he gets in trouble. He has been thrown out of five schools before.
Noble gases do not want to lose electrons because they have a full outer shell, so their ionization energy will be very high. Their electron affinity is close to zero because they also do not want to attract electrons to their cell since they already have all 8 valence electrons.
