Chemistry problems- wavelength, quantum numbers..?

Question

I need help understanding (in lay terms) some of these chemistry problems please.

1) How to determine wavelength,

2) How to determine how many quantum numbers are in 4f, 3d and so on,

and

3) How do I determine what charge (in C) is in an electron (3.10mol).

Any help would be appreciated, thankyou.

Answer 1

1)The experimental determination of the wavelength of monochromatic  light uses the principle of the interference. It needs a very parallel light bundle, a color filter (monochromator) and a lattice. The lattice width has to be of the magnitude of the wavelength of the used light.

The distance between the lattice and the screen (on that the interference patterns is to be illustrated) must be very large, in order to be able to measure a clear picture.. Now on the screen the developing maxima are marked and later their distances are measured.

2) Here is a nice picture of all orbitals:http://www.orbitals.com/orb/ov.htm

3) You can search for the charge of an electron. Multiply it with Avogadro´s number (6,022 · 10^23 mol−1) and 3.10 mol.