Question

why only one component of angular momentum is quantized of electron?

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Answer 1

Explanation:

Because Angular Momentum is one of the vector components of the 3D quantity called Activity, whose scalar part is Mechanical Action (a la Maupertuis). Since interactions are the quantized exchange of activity then both action is quantized (as Planck was compelled to admit) but so is angular momentum, as Bohr found.

Answer 2

Answer:

Yes, the angular momentum of an electron in an atom has a quantized orientation in space, though it cannot be determined exactly. Angular momentum is a vector quantity, meaning it has both magnitude and direction, and can be described by three components (in three dimensions).