Question

Spin angular momentum of an electron
1) always is same h/2π
2) integral multiple of h/2π

Answer 1

Electron momentum due to spin always is M_s = h(s(s+1))^1/2/2π, where s = ½, i.e. M_s = h√3/4π. Projection of the spin moment on a given direction M_sz = ± h/4π.