Guitar chords in the key of E:
E F#m Abm A B C#m Ebdim

Chord Em (3rd fret) notes: E, G, B, E and G. You should not play the 5th string.

The string 6 (E) is left open.

E minor chord's alternative names:
Emin, E-, (Mi minor, E moll).

Steps: 1-b3-5.
1(E), b3(G), 5(B).