Guitar chords in the key of A:
Chord A7 v.2 notes: A, E, A, C# and G. You should not play the 6th string.
This chord is played by placing a barre on fret two with your index finger. The string 5 (A) is left open.
A dominant 7th chord's alternative names: Adom7, (A septim).
1(A), 3(C#/Db), 5(E), b7(G).