F Major has a relative minor key of D Minor and has the key if B Flat.
There are 12 major keys in music theory.
There are 12 keys in music, including major and minor keys.
The piano has a total of 88 keys (52 white keys and 36 black keys).
There are 12, from C to B.
Johann Sebastian Bach composed a significant amount of music in both major and minor keys, but his works in major keys slightly outnumber those in minor. This is reflective of the broader Baroque practice, which often favored major keys for their bright, uplifting qualities. However, Bach's mastery of minor keys is evident in many of his most profound and emotionally rich compositions, such as the "St. Matthew Passion" and "The Well-Tempered Clavier." Overall, while he used both, the balance leans slightly towards major keys.
Only one: the F-sharp.
The diatonic scale that is played mostly on the black keys is F# major (also known enharmonically as Gb Major). The scale that is played only on black keys is the five note F# pentatonic scale. (AKA Gb pentatonic scale).
You'll have to rephrase your question. There are no major keys in a chord. A chord is three or more notes sounded simultaneously. A major key is the set of notes in a major scale. There are chords within keys, there are no keys within chords.
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Almost every modern piano has 36 black keys and 52 white keys for a total of 88 keys in all.
78 Keys
It varies by key, just like with major keys. There can be as few as one flat (D minor) or all seven flats (A-flat minor). Minor keys can have sharps too.