There are eight notes (steps) in a major musical scale. If whole steps are tones and half steps are semitones, then the order is tone, tone, semitone, tone, tone, tone, semitone.
It contains 7 individual notes, with the tonic often repeated at the octave. For example, C major is C D E F G A B C. That top C doesn't count as an 8th pitch.
7 notes are in the major scale. Example: The C major scale would be C, D, E, F, G, A, B, and C again, which is 8 notes when played, but technically the C wouldn't be counted twice so you only end up...