Question

How do you make a plot of the transition frequency versus (1/2^2 -1/n^2 ) for helium and then Determine figure out the Zeff. what is the transition frequency?

Answer 1

The effective nuclear charge Zeff is the net positive charge experienced by an electron in a multi-electron atom.

A given electron does not experience a full nuclear charge because the other electrons are sometimes between it and the nucleus and shield it from the nucleus.

The formula for effective nuclear charge is

Zeff=Z–S

where

Z is the number of protons in the nucleus, and
S is the shielding constant, the average number of electrons between the nucleus and the electron in question.

the second electron shields the first by 0.30 units.

Zeff=Z–S=2–0.30=1.70

The frequencyassociated with the difference between two discrete energy levels in an atomic system, given by

where f 2,1 is the frequency associated with the difference between two energy levels, E2 and E 1 (E 2> E 1), and is Planck's constant.