The notes of the G Major chord are G, B and D.
G, b, d
The 'G' Major chord is 'G','D','B'
C Major chord = C E G
The E-major triad is composed of an E, a G#, and a B. To make this chord minor, flat the G#.
CEG make up a C Major chord
If you mean what are the notes, it's E, G#, and B. Added: if you mean an E major chord.
E-g#-b-d#
C major
E Major triad consists of E, G# and B.
The notes in the D major chord are D, F-sharp, and A.
The notes to a c chord are c as the root, e as the third, and g as the fifth. The notes can vary, depending on the fact that the chrod could be augmented, diminished, major, or minor.