Quantum Numbers

The quantum number which explains about size and energy of the orbit or shell is:

If $\mathrm{l}=1$ for an atom then the number of orbitals in its sub-shell is

Write the four quantum numbers for $1{\mathrm{s}}^1$electron.

An electron in an atom has the following set of four quantum numbers to which orbital does it belong.
 

Write the four quantum numbers for the differentiating electron of a sodium $\left(\mathrm{Na}\right)$ atom?

How many spin orientations are possible for an electron in an orbital?

How many subshells are present at a principal energy level?

How many maximum numbers of electrons can be accommodated in a sub shell?

How many maximum numbers of electrons can be accommodated in a principal energy level?

Explain the significance of three Quantum numbers in predicting the positions of an electron in an atom.