This interval is an example of a tone (as opposed to a semitone).
A whole step.
C D E F G A B C is the C Major scale.
C, D, and E are the first three notes of the C major scale.
D major isn't actually a note. D major is a major scale based on the note D (D natural) and the scale has two sharps (F sharp and C sharp). There isn't anything special about D major since it requires both an F sharp and a C sharp, the most 'special' scale is C major since there are no flats or sharps needed.
If you mean the same key-note, the simple answer is 'no'. A home tone is the note a particular scale starts on; for example - in the Ab major scale, Ab is the keynote and in the key of D major the key-note is D. The only common scales with C as a home tone are C major, C minor harmonic, C minor melodic, C minor (natural), C blues scale etc.
Flatten the third and seventh notes in the scale. Therefore, if you're in the key of A major the notes are A, B, C#, D, E, F#, G#, A. Therefore, flattening the 3 and 7, you end up with A, B, C, D, E, F, G, A. By the way, Am is the relative minor of the key of Cmajor, which has no sharps or flats.
The D major scale has F# and C#.
The a major scale is a,b,c#,d,e,f#,g#,a. the b major scale is b,c#,d#,e,f#,g#,a#,b. the c major scale is c,d,e,f,g,a,b,c. the d major scale is d,e,f#,g#,a,b,c#,d. the e major scale is e,f#,g#,a,b,c#,d#,e. the f major scale is f,g,a,b-flat,c,d,e,f. the g major scalle is g,a,b,c,d,e,f#,g.
The C major scale is: C, D, E, F, G, A, B, C.
The C major scale is: C, D, E, F, G, A, B, C.
The D Major scale has two sharps, F and C. The notes in this scale are D, E F sharp, G, A, B, C sharp, D.
A major scale is made up of whole steps and half steps. Whole-whole-half-whole-whole-whole-half. For example C Major would be C-D-E-F-G-A-B-C. D Major would be D-E-Fsharp-G-A-B-Csharp-D.
C D E F G A B C is the C Major scale.
The supertonic of any scale is the second degree of the scale. Therefore, the supertonic of C major is D.
The 2nd in C major is D.
The minor scale is different from a major scale because the third, sixth, and seventh are one half step lower than a major scale. For example, a C major scale is C, D, E, F, G, A, B; a C minor scale is C, D, Eb, F, G, Ab, Bb. The Eb, Ab, and Bb are one half step lower, which gives the minor scale its distinct sound.
The C major scale is the only diatonic (major) scale without sharps or flats. The notes are simply C, D, E, F, G, A, B and C.
The pentatonic scale is formed by the 1, 2, 3, 5 and 6 degrees from a major scale. For example, a C pentatonic has the notes C, D, E, G and A.