Diatonic Triad and Seventh Chord Qualities

Triads
Major (M) Tonic Supertonic Mediant Subdominant Dominant Submediant Leading Tone
I
Major		 ii
Minor		 iii
Minor		 IV
Major		 V
Major		 vi
Minor		 vii°
Diminished
Minor (m) Tonic Supertonic Mediant Subdominant Dominant Submediant Subtonic Leading Tone
i
Minor		 ii°
Diminished		 III
Major		 iv
Minor		 v
Minor*		 VI
Major		 VII
Major		 vii°
Diminished
Seventh Chords
Major (M) Tonic Supertonic Mediant Subdominant Dominant Submediant Leading Tone
I7
Major-Major		 ii7
Minor-Minor		 iii7
Minor-Minor		 IV7
Major-Major		 V7
Major-Minor		 vi7
Minor-Minor		 viiø7
Half-Diminished
Minor (m) Tonic Supertonic Mediant Subdominant Dominant Submediant Subtonic Leading Tone
i7
Minor-Minor		 iiø7
Half-Diminished		 III7
Major-Major		 iv7
Minor-Minor		 v7
Minor-Minor*		 VI7
Major-Major		 VII7
Major-Minor		 vii°7
Fully Dimin.

* In practice, V in minor has a raised leading tone, and is altered to become a major triad or major-minor seventh.