Look at the amount of energy it takes to remove a valence electron from He, Ne, Ar, Kr, and Xe compared to atoms in the same period (row). Based on what you know about ionization energy, why
what does that tell you about the tendency of these elements to react with other elements?

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.