There are 8 notes in an octave.
8 including the one you started on 7 if you don't count that one
In a diatonic scale, there are eight notes in an octave.
Two each have 6 keys in between them
There eight notes in an octave, and it depends on what key you are in as to what exact notes you have, like in the key of D flat you have: d flat, e flat, f, g flat, a flat, b flat, c, then back to d...