The formula of an ionic compound is actually the ___ in which the ions are present. This can be easily determined because the overall charge on an ionic compound must be
. As this formula gives a ratio rather than actual numbers of ions, it is called an
formula.

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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.