[Alquimista]

Can someone please explain to me the significance of the principal and secondary quantum numbers.

[cliverlong]

Can someone please explain to me the significance of the principal and secondary quantum numbers.

Assuming by "significance" you mean "meaning", and you mean electron quantum numbers, a Google search of the phrase "principal quantum number" turned up the following entry first in the list
http://en.wikipedia.org/wiki/Principal_quantum_number
Then the following for "quantum number"
http://en.wikipedia.org/wiki/Quantum_number
and
http://en.wikipedia.org/wiki/Azimuthal_quantum_number
- which I believe is the second quantum number.

Clive