The artistic term for this is Hue
O Value
Line
O Color
O Shape

It is color

Explanation:

A hue is the actual color of something, such as naphthol red, sap green, or ultramarine, or any name we give a pigment or combination of pigments. Essentially, a hue is what we more often refer to as color, though hue is more technically correct. Hope this helps! :3

b i think if not it should be a pretty sure but not

including the octave, the answer would 8 notes in a major scale with one note being played twice. ex) c major scale includes: c, d, e, f, g, a, b, c

notice that c is played twice

however, if you were to ask me how many different notes are in a major scale- the answer would be 7.