The chord’s top note moves upwards, and the bass note downwards, to a 7th chord – but in what key, and are those rising notes part of the chord or not? More ink has been spilled over these ...

except chord VII - the notes B – D – F, which is diminished. When a seventh is added to a chord this is known as a seventh chord. The dominant seventh of a V chord can be shown by the symbol V7.