How is the total angular momentum quantized?

In units of the Planck constant h, the projection of the spin on the direction chosen in space is + 1/2, so it is often said for brevity that an electron has spin 1/2, or half-integer spin.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.