How many electrons are in each orbit?

Well, the first valence electron shell contains 2 valence electrons, which every element has (with the exception of hydrogen), and all shells afterwards can hold up to 8 electrons. -So, by totaling,...

s holds 2 electrons (e-) p holds 6 electrons (e-) d holds 10 electrons (e-) f holds 14 electrons (e-)This is true if you mean orbitals and not orbits.

2 in the first, 8 in the second, 8 in the third and 1 in the forth This is true if you are meaning energy levels. Energy levels are not orbits.

The atomic no. of Sodium (Na) is 11. It has three electron orbits (or Shells) containing 2, 8 and 1 electron respectively. K shell - 2 electrons L shell - 8 electrons M shell - 1 electron

Only one electron an one orbit.