The chromatic scale is based upon a sequence of semitones only and this includes every possible note within one octave. Here is the C chromatic scale.
The same scale could be written out using flats, however it is more common to do this when descending, as such;
Because the chromatic scale contains every possible note, all chromatic scales are exactly the same apart from the starting note. The following example of the A chromatic scale contains exactly the same notes as the C chromatic scale. The only difference between the A and C chromatic scale is the note which they begin on. This starting note in all scales, is referred to as the tonic or key note.