major - minor - minor - major - major - minor - diminished
That is typically represented with the roman numerals so, that numbers marking the major chords are capital letters and the numbers marking minor/dim chords are in lowercase.
That makes the chord formula
I - ii - iii - IV - V - vi - vii°
In other words I, IV and V chords are always major chords in all major keys.
What becomes to a chord (or a note) being sharp # (or flat b) has nothing to do wheather the chord is a major or minor. Sharp and flat notes are determined by the key in which the song is written.
The notes in a major key follows the formula:
tonic- whole step - whole step - half step - whole step - whole step - whole step - half step (to the tonic one octave above)
For exemple the key of B-major has five accidentials (sharps), the notes of the key are
B - C# - D# - E - F# - G# - A# - B
thus the chords in the key of B-major are
B - C#m - D#m - E - F# - G#m - A#dim - B
The V-chord F# is also sharp.
