Question

an emission of green visible light from the Cu2+ ion. The literature reports emission of blue visible light from the Cu+ ion. Choose the statement(s) below that best explain this data. (Select all that apply.)
The Cu+ ion has a greater effective nuclear charge than the Cu2+ ion.
Increasing the effective nuclear charge on an ion results in energy levels that are closer together.
Increasing the effective nuclear charge on an ion results in the emission of higher frequency photons.
Increasing the effective nuclear charge on an ion results in the emission of shorter wavel

Answer 1

Increasing the effective nuclear charge on an ion results in the emission of shorter wavelength photons.
The Cu2+ ion has a greater effective nuclear charge than the Cu+ ion.
There is no reasonable explanation.

Answer 2

the emission of a photon is proportional to the distance of electron transitions between orbitals, as the "fall" back down to ground state from an excited state. Increasing the oxidation number of an ion decreases it's radius and thus the distance between the transitions, lower distance longer wavelength, lower energy photon.

Answer 3

soo
this is true:
The Cu2+ ion has a greater effective nuclear charge than the Cu+ ion.
Increasing the effective nuclear charge on an ion results in energy levels that are closer together.