The three major chords in a key are built upon the first, fourth, and fifth notes of the scale.

Arpeggios are the 1st (root), 3rd, 5th. You may also add the 7th or flattened 7th for a minor scale.

 ARPEGGIOS

Minorr Pentatonic Arpeggio Scale Root  --      3rd   5th    7th   A C# E G# B D# F# A# C E G B D F# A C# E G# B D# F A C E G B D F#

Minor Pentatonic Arpeggio Scale Root    flat 3rd   5th   flat 7th   A C E G B D F# A C Eb G Bb D F A C E G B D F Ab C Eb G Bb D F

Major Pentatonic Scale Root   2nd   3rd   5th   6th   A B C# E F# B C# D# F# G# C D E G A D E F# A B E F# G# B C# F G A C D G A B D E

Minor Pentatonic Scale Root   flat 3rd   4th   5th   flat 7th   A C D E G B D E F# A C Eb F G Bb D F G A C E G A B D F Ab Bb C Eb G Bb C D F

Chromatic Scale- One Octive

The Major Scales C = C - D - E - F - G - A - B - C D = D - E - F# - G - A - B - C# - D E = E - F# - G# - A - B - C# - D# - E F = F - G - A - Bb - C - D - E - F G = G - A - B - C - D - E - F# - G A = A - B - C# - D - E - F# - G# - A B = B - C# - D# - E - F# - G# - A# - B C# = C# - D# - E# (=F) - F# - G# - A# - B# (=C) - C# Db = Db - Eb - F - Gb - Ab - Bb - C - Db Eb = Eb - F - G - Ab - Bb - C - D -Eb F# = F# - G# - A# - B - C# - D# - E# (=F) - F# Gb = Gb - Ab - Bb - Cb (=B) - Db - Eb - F - Gb Ab = Ab - Bb - C - Db - Eb - F - G - Ab Bb = Bb - C - D - Eb - F - G - A - Bb